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/ 让学习更有效 新课备课备考 | 英语学科
/ 让学习更有效 新课备课备考 | 英语学科
2025年人教新目标版九年级英语上册精讲精练
Unit 8 It must belong to Carla.
核心语法：too...to...的用法
一、核心概念
too...to... 结构表示"太...以至于不能..."，具有否定含义，用于表达某种程度过高导致无法实现的结果。
基本结构：too + 形容词/副词 + to do
二、基本用法
句型 结构 例句 含义
基本形式 too + adj./adv. + to do He is too young to go to school. 他太小，不能上学。
加for短语 too + adj./adv. + for sb. + to do The box is too heavy for me to carry. 箱子太重，我搬不动。
加名词 too + adj. + a/an + n. + to do It is too difficult a problem to solve. 这个问题太难，无法解决。
三、特殊用法
never too...to（永不太...而不能）
It is never too late to learn.（学习永不嫌晚。）
only too...to（非常乐意）
I am only too glad to help you.（我非常乐意帮助你。）
but/only too...to（非常...）
He is but too ready to help others.（他太乐于助人了。）
四、too...to...与so...that...的转换
too...to... 可以与 so...that... 结构相互转换，表示相同的否定含义。
原句 转换句
He is too tired to walk. He is so tired that he can't walk.
The problem is too difficult to solve. The problem is so difficult that we can't solve it.
五、易错点分析
1、误加否定词
He is too young not to go to school.（错误）
He is too young to go to school.（正确）
2、逻辑主语错误
The room is too small for us to live.（错误）
The room is too small for us to live in.（正确）
3、不定式to的遗漏
He is too tired walk.（错误）
He is too tired to walk.（正确）
六、记忆口诀
“too...to...表否定，太...而不能记分明。
后接动词原形跟，for加人或物也行。
若遇名词中间放，形后名前提醒。
多练多用多体会，too...to...用法不再难。”
1．—Excuse me, do you mind my sitting here for a while I’m too tired to walk any further.
—________. The old lady sitting here has just left.
A．Yes, please B．Never mind C．I hope so D．Certainly not
2．My brother is too young to dress ________, so I help him.
A．himself B．me C．him
3．Kitty is too excited to express ________ clearly.
A．she B．her C．hers D．herself
4．I’m too tired to move on. Let’s have a ________.
A．rest B．team C．game D．shower
5．The math problem is too hard for me to ________. I am going to ask my teacher for help.
A．work out B．care for C．think over
6．She is ________ tired ________ she can’t walk any more.
A．so; that B．too; to C．very; that D．such; that
7．I often go to bed late because I have ________ homework to do every day.
A．too much B．too many C．much too D．many too
8．—We have ________ work to do every day.
—Right. we feel ________ tired after getting home.
A．too much; much too B．much too; too many
C．too much; too much D．too many; much too
9．—Mum, it’s too much work to clean the whole garden by myself.
—Then ask your sister to help!
— ________.
A．Every dog has its day. B．Many hands make light work. C．The early bird catches the worm.
10．I have ________ rules in my home, and I have ________ homework to do today.
A．too many; too much B．too many; much too C．too much; too many D．much too; too many
11．Playing too much online games is harmful to teenagers’ health. I think the games ________.
A．should turn off B．should be turned off C．turn off
12．—Bob, you look too exhausted. What’s the matter
—I was ________ busy with my report ________ I stayed up all night.
A．so; that B．too; to C．enough; to D．such; that
13．— Dad, I want to drive to my friend’s home.
— Don’t be ________. You are too young to drive.
A．sleepy B．absent C．ugly D．silly
14．It’s a ________ to order too much food and leave a lot when you eat out.
A．matter B．trouble C．waste D．stress
15．Interest is the best teacher. It’s never too late to start ________ you find a new hobby.
A．because B．so C．and D．once
16．The book tells the story of a girl called Mulan ________ father was too sick to fight as a soldier.
A．who B．whose C．that D．which
17．Don’t add too ________ salt to your dishes. It’s bad for your heart and blood pressure.
A．little B．few C．many D．much
18．Robots __________ jobs that are too dangerous for people to do by themselves.
A．insist on B．take on C．live on D．depend on
19．The little girl is too young to look after ________.
A．she B．her C．hers D．herself
20．Mike thinks playing football is too difficult, he ________ basketball.
A．prefers to play B．prefer to play C．prefer playing D．prefers play
21．—She is too busy to help us finish the task.
—Let’s do it ________.
A．herself B．myself C．itself D．ourselves
22．—Mum is too busy to make dinner for us.
—Let’s do it ourselves, ________ we shouldn’t depend on our parents too much.
A．because B．but C．or
23．—I failed another math test. I’m starting to think I’ll never improve.
—Don’t give up! Keep trying. Remember, _________.
A．one is never too old to learn B．it never rains but it pours
C．every dog has its day D．when in Rome, do as the Romans do
24．—Knock, knock! Stop talking! Don’t stay up too late, or you will be too tired to enjoy the trip tomorrow!
—OK! ________. Good night, teachers!
A．Forget it. B．Got it. C．Make it. D．That’s it.
25．—This problem is too hard to ________. Will you give me some advice
—Of course.
A．look through B．work out C．give away D．pick up
26．He always worries _________; he needs to learn to relax.
A．much too B．too many C．too much
27．It’s not too late to fix the problem ________ time is clearly getting short.
A．as B．since C．unless D．although
28．The cookies were ________ sweet for my taste, so I decided to eat a healthier snack instead.
A．too much B．much too C．too many D．too little
29．—Don’t always be too hard ________ yourself. This can be harmful ________ your health.
—Thanks for your advice.
A．on; to B．to; on C．with; to D．with; for
30．—Would you like to see the film with me
—________. I have too much homework to do.
A．Sure, I’d like to B．Sounds like a great idea
C．I can’t wait. Let’s go D．I’d love to, but I am busy
31．Today is the 55th Earth Day and I think we should call on (号召) people not to _________ too many trees.
A．cut down B．cut up C．cut off D．cut in
32．—Oh, you’d better not take your daughter. She is too young to sit ________ the whole concert (音乐会).
—You are exactly right.
A．through B．in C．at D．by
33．I have ________ rules to follow and ________ homework to do. It’s terrible.
A．too many; too many B．too much; too many C．too many; too much D．too much; too much
34．—The desk is too heavy. It’s not easy for me to ________ it to the next room.
—Don’t worry. We will help you.
A．show B．move C．give D．pay
35．The ________ of the table is too wide for me to reach the book on the other side.
A．length B．height C．width D．depth
36．—My guest won’t come tonight. Is it too late to ________ the order
—Let me see. The food is not ready. I’ll tell the cook at once.
A．take B．follow C．change D．cancel
37．Don’t ________ your parents too much. You should learn to look after yourself.
A．depend on B．go by C．stay with D．put on
38．—Tom, don’t stay up too late to prepare for the final exam. ________.
—OK, Miss Lee.
A．Don’t burn the candle at both ends
B．The early bird catches the worm
C．Many hands make light work
39．— When I am too tired to think, I like to lie down and ________ my brain.
— Sounds great. You can relax by doing this.
A．set off B．go off C．turn off D．shut off
40．—I got up late and missed the school bus again this morning.
—________. I have told you many times not to stay up too late.
A．It’s a piece of cake B．It serves you right
C．Practice makes perfect D．Hope you right
41．The worker ________ has too much work to do, so he is ill now.
A．sometimes B．seldom C．always D．never
42．It’s bad for Simon to spend too much money on video games. He should learn ________ to manage money.
A．when B．what C．how D．where
43．—Should teenagers be allowed to choose their future jobs
—I’m afraid not. I think they are too young to make the choice ________.
A．they B．their C．themselves
44．My jeans are too long for me to wear. I want to buy a shorter ________.
A．one B．pair C．it D．jeans
45．You’re never too old to learn. For this _________, it’s always a great time to start a new hobby.
A．reason B．hobby C．number
46．The trip sounds really ________. I would like to go next time too.
A．boring B．important C．exciting D．funny
47．My brother is only five years old. He is ________ young ________ answer such a difficult question.
A．so; that B．too; to C．to; too D．such; that
48．It’s too expensive to take a taxi. Let’s go there by underground ________.
A．once B．already C．instead
49．As students, we ________ pay too much attention to our pronunciation, for it plays an important role in learning English.
A．can’t B．mustn’t C．needn’t D．shouldn’t
50．—You should not spend too much time ________ computer games.
—Thank you , but I don’t know how to live ________ a better way.
A．to do, in B．doing, in C．to do, on D．doing, on
/ 让学习更有效 新课备课备考 | 英语学科
/ 让学习更有效 新课备课备考 | 英语学科
21世纪教育网(www.21cnjy.com)
21世纪教育网(www.21cnjy.com)
参考答案及试题解析
1．D
【解析】句意：——对不起，你介意我在这儿坐一会儿吗？我太累了，走不动了。 ——当然不。坐在这里的那位老太太刚走。
考查情景交际。Yes, please是的，请；Never mind没关系；I hope so我希望如此；Certainly not当然不。根据“The old lady sitting here has just left.”可知，答话人不介意问话人坐在这里。故选D。
2．A
【解析】句意：我弟弟太小不能给自己穿衣，所以我帮助他。
考查代词用法。himself他自己，反身代词；me我，宾格；him他，宾格。根据“My brother is too young to dress...”可知，弟弟太年轻而不能自己穿衣服，故空处指“他自己”，需反身代词。故选A。
3．D
【解析】句意：Kitty太兴奋了，无法清楚地表达自己。
考查代词辨析。she她；her她；hers她的；herself她自己。根据“Kitty is too excited to express...clearly”可知，她兴奋到以至于无法清楚地表达自己，用反身代词herself。故选D。
4．A
【解析】句意：我太累了，走不动了。让我们休息一下吧。
考查名词辨析。rest休息；team团队；game游戏；shower淋浴。根据“I’m too tired to move on.”可知，太累走不动时，应该是想休息，故选A。
5．A
【解析】句意：这道数学题对我来说太难了，我无法做出来。我打算向老师求助。
考查动词短语辨析。work out解决；care for关心；think over仔细考虑。根据“The math problem is too hard for me to...”可知，数学题太难导致我没有办法做出来，选项A的“work out”符合题意。故选A。
6．A
【解析】句意：她太累了以至于她不能再走路了。
考查结果状语从句。so…that如此……以至于，so+形容词/副词+that+句子；too…to太…而不能，too+形容词/副词+to do sth；very…that，无very…that的固定搭配；such…that如此……以至于，such+名词+that+句子。根据“She is…tired…she can’t walk any more.”可知，此处表示，她太累了以至于无法走路。“tired”为形容词，因此用so…that引导结果状语从句，故选A。
7．A
【解析】句意：我每天经常熬夜，因为我有太多作业要做。
考查短语辨析。too much太多，修饰不可数名词；too many太多，修饰可数名词复数；much too太，修饰形容词或副词；many too无此搭配。根据“homework”可知，此处需用“too much”修饰不可数名词，故选A。
8．A
【解析】句意：——我们每天有很多作业要做。——是的，回到家后我们非常累。
考查短语辨析。too much“太多……”，修饰不可数名词； much too“太……，非常……”，修饰形容词或副词。第一空修饰名词work，且是不可数名词，因此用too much；第二空修饰形容词tired，因此用much too。故选A。
9．B
【解析】句意：——妈妈，我自己打扫整个花园太累了。——然后请你的姐姐帮忙！——众人拾柴火焰高。
考查谚语。Every dog has its day.凡人皆有得意时；Many hands make light work.众人拾柴火焰高；The early bird catches the worm.早起的鸟儿有虫吃。根据“Then ask your sister to help!”可知，妈妈的建议是找姐姐帮忙，意思是“多人合作，工作变轻松”，直接对应妈妈的建议（找人帮忙）即“众人拾柴火焰高”符合。故选B。
10．A
【解析】句意：我家有太多规矩，而且我今天有太多作业要做。
考查形容词副词词组辨析。too many太多，修饰可数名词复数；too much太多，修饰不可数名词；much too太，修饰形容词或副词。第一空rules“规则”是可数名词复数，需用修饰可数名词的too many，第二空homework“作业”是不可数名词，需用修饰不可数名词的 too much。故选A。
11．B
【解析】句意：玩太多网络游戏对青少年的健康有害。我认为这些游戏应该被关闭。
考查语态。分析句子可知，句子主语“the games（游戏）”是动作的承受者，作主语时需用被动语态。被动语态的基本结构为 “be + 过去分词”，情态动词 “should”后需接动词原形be。故选B。
12．A
【解析】句意：——鲍勃，你看起来太累了。怎么了？——我忙于报告，以至于彻夜未眠。
考查结果状语从句。so; that如此……以至于……，so后面加形容词that引导结果状语从句，too; to太……而不能……；enough; to足够……可以；such; that如此……以至于……，such后面加名词。根据“I was...busy with my report...I stayed up all night.”可知，是忙于报告，以至于彻夜未眠，第一空后为形容词，用so连接。故选A。
13．D
【解析】句意：——爸爸，我想开车去朋友家。——别傻了。你太小了，不能开车。
考查形容词辨析。sleepy困倦的；absent缺席的；ugly丑陋的；silly愚蠢的。根据“You are too young to drive”可知，父亲告诉孩子他太小了不能开车，因此是让孩子不要傻了，故选D。
14．C
【解析】句意：当你在外面吃饭时，点太多的食物而留下很多食物是一种浪费。
考查名词辨析。matter问题；trouble麻烦；waste浪费；stress压力。根据“It’s a …to order too much food and leave a lot when you eat out.”可知，点太多食物没有吃完是一种浪费。故选C。
15．D
【解析】句意：兴趣是最好的老师。一旦你找到了一个新的爱好，任何时候开始都不晚。
考查连词辨析。because因为；so所以；and和；once一旦。根据“It’s never too late to start... you find a new hobby.”可知，一旦找到新爱好，开始永远不会太晚。故选D。
16．B
【解析】句意：这本书讲述了一个叫木兰的女孩的故事，她的父亲病得太重，不能当兵打仗。
考查定语从句。根据“The book tells the story of a girl called Mulan...father was too sick to fight as a soldier.”可知，此处是定语从句，先行词是“a girl”，指人，且在从句中作定语，修饰名词“father”，所以用whose引导定语从句。故选B。
17．D
【解析】句意：不要在你的菜里加太多盐。这对你的心脏和血压都不好。
考查形容词辨析。little几乎没有，修饰不可数名词；few几乎没有，修饰可数名词复数；many许多，修饰可数名词复数；much许多，修饰不可数名词。根据“It’s bad for your heart and blood pressure.”可知，此处是不要在菜里加太多盐，salt“盐”是不可数名词，此处用much修饰，故选D。
18．B
【解析】句意：机器人承担那些对人类来说独自完成太危险的工作。
考查动词短语辨析。insist on坚持；take on承担，呈现；live on以……为生；depend on依赖。根据“jobs that are too dangerous for people to do by themselves”可知，此处表示机器人承担危险工作，take on符合语境。故选B。
19．D
【解析】句意：这个小女孩太小了，不能照顾她自己。
考查代词用法。she她，主格；her她，她的，宾语或形容词性物主代词；hers她的，名词性物主代词；herself她自己。根据“The little girl is too young to look after...”可知，空处指“照顾她自己”，look after oneself表示“照顾自己”，这里主语是The little girl，所以用herself。故选D。
20．A
【解析】句意：Mike认为踢足球太难了，他更喜欢篮球。
考查动词短语和时态。prefer to do sth. “更喜欢做某事”，动词短语。根据“thinks”可知，时态为一般现在时，主语he是第三人称单数，prefer要用第三人称单数形式prefers。故选A。
21．D
【解析】句意：——她太忙了不能帮我们完成任务。——让我们自己完成。
考查代词辨析。herself她自己；myself我自己；itself它自己；ourselves我们自己。根据“She is too busy to help us finish the task.”和“Let’s do it”可知，此处指我们自己完成任务，用ourselves。故选 D。
22．A
【解析】句意：——妈妈太忙了，不能为我们做晚饭。——让我们自己做吧，我们不应该太依赖我们的父母。
考查连词辨析。because因为；but但是；or或者。根据题干“Let’s do it ourselves,”和“we shouldn’t depend on our parents too much.”可知，前后文是因果关系，用because(因为)引导原因状语从句符合题意。故选A。
23．C
【解析】句意：——我数学考试又不及格。我开始觉得我永远都不会进步了。 ——别放弃！继续努力。记住，凡人皆有得意日。
考查谚语。one is never too old to learn活到老，学到老；it never rains but it pours祸不单行；every dog has its day凡人皆有得意日；when in Rome, do as the Romans do入乡随俗。根据“Don’t give up! Keep trying.”可知，不要放弃，坚持努力，所以此处是鼓励对方不要气馁，只要坚持就会有成功的一天。故选C。
24．B
【解析】句意：——（敲门）别说话了！别熬夜太晚，否则明天你会太累而无法享受旅行！——好的！知道了，晚安，老师们！
考查情景交际。Forget it算了吧、别在意；Got it明白了、知道了；Make it成功做到、约定时间；That’s it就是这样、到此为止。根据“Stop talking! Don’t stay up too late, or you will be too tired to enjoy the trip tomorrow! OK!...Good night, teachers!”可知，句中表述老师们提醒学生们不要熬夜、早点休息，此处是对老师们的提醒进行回应，“Got it”意为“知道了、明白了”符合语境，表明接受了对方的建议。故选B。
25．B
【解析】句意：——这个问题太难了，解不出来。你能给我一些建议吗？——当然可以。
考查动词短语。look through浏览；work out解决；give away赠送；pick up捡起。根据“This problem is too hard to”可知，问题太难解决。故选B。
26．C
【解析】句意：他总是担心得太多，他需要学会放松。
考查形容词和副词短语。much too太，修饰形容词或副词；too many太，修饰可数名词复数；too much太，修饰不可数名词或动词。根据“He always worries …; he needs to learn to relax.”可知，此处修饰动词worries应用副词短语too much。故选C。
27．D
【解析】句意：虽然时间明显很紧了，但是解决问题还不太晚。
考查连词辨析。as因为，由于，当……时候；since自从……以来，既然；unless除非，如果不；although虽然，尽管。根据句意“It’s not too late to fix the problem…time is clearly getting short”可知，前后两个句子之间存在转折关系，应用although引导让步状语从句。故选D。
28．B
【解析】句意：饼干对我来说太甜了，所以我决定吃更健康的零食。
考查短语辨析。too much太多，修饰不可数名词；much too太，修饰形容词或副词；too many太多，修饰可数名词；too little太少，修饰不可数名词。根据“The cookies were...sweet for my taste”可知，空格后是形容词sweet，用much too修饰。故选B。
29．A
【解析】句意：——不要总是对自己太苛刻。这对你的健康有害。——谢谢你的建议。
考查固定搭配。on在……上面；to到；with和；for为了。be hard on sb.“严厉对待某人”，be harmful to“有害于”，都是固定短语；结合选项，故选A。
30．D
【解析】句意：——你想和我一起看电影吗？——我很想去，但我很忙。我有太多的家庭作业要做。
考查情景交际。Sure, I’d like to当然，我很想去；Sounds like a great idea听起来是个好主意；I can’t wait. Let’s go我等不及了，我们去吧；I’d love to, but I am busy我很想去，但我很忙。根据“I have too much homework to do.”可知，是不能去。故选D。
31．A
【解析】句意：今天是第55个地球日，我认为我们应该呼吁人们不要砍伐太多的树木。
考查动词短语。cut down砍倒；cut up切碎；cut off切断；cut in插嘴。结合“too many trees.”可知，这里是指砍树。故选A。
32．A
【解析】句意：——哦，你最好别带你女儿去。她还太小，整场音乐会坐不下来。——你说得很对。
考查介词辨析。through自始至终、从头到尾；in在……里面；at在，后加时刻或者小地点；by通过。根据“She is too young to sit...the whole concert”可知，女儿年纪太小了，无法从头坚持到音乐会结束。故选A。
33．C
【解析】句意：我有太多规则要遵守，还有太多作业要做，这太糟糕了。
考查短语辨析。too many太多，修饰名词复数；too much太多，修饰不可数名词。“rules”是可数名词复数，用“too many”；“homework”是不可数名词，用“too much”。故选C。
34．B
【解析】句意：——这张桌子太重了。对我来说，把它搬到隔壁房间可不容易。 ——别担心。我们会帮你。
考查动词辨析。show展示；move移动；give给；pay支付。根据“The desk is too heavy. It’s not easy for me to...it to the next room.”可知，此处表示把桌子搬到隔壁房间。故选B。
35．C
【解析】句意：桌子的宽度太宽了，我够不到另一边的书。
考查名词辨析。length长度；height高度；width宽度；depth深度。根据“too wide”可知说的是桌子的宽度。故选C。
36．D
【解析】句意：——我的客人今晚不来了。现在取消订单是不是太晚了？——让我看看。菜还没准备好，我马上告诉厨师。
考查动词辨析。take携带；follow跟随；change改变；cancel取消。根据“My guest won’t come tonight.”可知，客人不来了应该是取消订单。故选D。
37．A
【解析】句意：不要太依赖你的父母。你应该学会照顾自己。
考查动词短语。depend on依赖；依靠；go by经过；（时间）流逝；stay with与……待在一起；put on穿上；上演。根据“You should learn to look after yourself.”可知此处表达的是不要过度依赖父母，故选A。
38．A
【解析】句意：——汤姆，不要熬夜准备期末考试。——好的，李老师。
考查谚语。Don’t burn the candle at both ends.不能过度消耗精力；The early bird catches the worm.早起的鸟儿有虫吃；Many hands make light work.众人拾柴火焰高。根据题干中的“don’t stay up too late”可知，不能过度消耗精力。故选A。
39．D
【解析】句意：——当我太累不能思考的时候，我喜欢躺下并停止用我的大脑。——听起来不错。你可以通过这么做放松。
考查动词短语辨析。set off出发；go off爆炸；turn off关闭（开关）；shut off停止运转。根据“When I am too tired to think, I like to lie down and … my brain”可知应是停止用脑思考，故shut off符合语境，故选D。
40．B
【解析】句意：——今天早上我起晚了，又错过了校车。——这是你自找的。我告诉过你很多次，不要熬夜太晚。
考查情景交际。It’s a piece of cake小菜一碟；It serves you right这是你自找的；Practice makes perfect熟能生巧；Hope you right希望你是对的。根据“I have told you many times not to stay up too late.”可知，告诉过你很多次不要熬夜太晚，所以没赶上校车是“你自找的”。故选B。
41．C
【解析】句意：这名工人总是有太多的工作要做，所以他现在生病了。
考查频率副词。sometimes有时；seldom很少；always总是；never从不。根据“so he is ill now.”可知该工人因为过多的工作而生病，说明他总是工作过度，频率很高，故选C。
42．C
【解析】句意：西蒙在电子游戏上花太多钱是不好的。他应该学会如何理财。
考查疑问词。when何时；what什么；how怎样；where在哪里。根据“It’s bad for Simon to spend too much money on video games. He should learn … to manage money.”可知，此处指学会如何理财，故选C。
43．C
【解析】句意：——青少年应该被允许选择未来的工作吗？——恐怕不行。我认为他们太年轻了，不能自己做出选择。
考查代词辨析。they他们，人称代词主格；their他们的，形容词性物主代词；themselves他们自己，反身代词。根据“I think they are too young to make the choice…”的语境可知，此处指他们太年轻了，不能自己做出选择，应用反身代词。故选C。
44．B
【解析】句意：我的牛仔裤太长了，穿不了。我想要买一条短一点的。
考查名词辨析和代词的用法。one一，常用于泛指同类中的一个；pair一对，常用于泛指同类中的一双或一对；it它，单数概念；jeans牛仔裤，常用作复数。根据“My jeans are too long for me to wear.”可知，牛仔裤太长了，因此想买一条短一点的牛仔裤，空格处泛指同类牛仔裤中的另一条，jeans“牛仔裤”常用作复数，应用pair指代。故选B。
45．A
【解析】句意：活到老，学到老。因此，这总是一个开始新爱好的好时机。
考查名词辨析。reason原因；hobby爱好；number数字。根据“You’re never too old to learn”可知，设空处应填入“reason”表示“原因”，故选A。
46．C
【解析】句意：这次旅行听起来真让人激动。下次我也想去。
考查形容词辨析。boring无聊的；important重要的；exciting令人兴奋的；funny有趣的。根据“I would like to go next time too.”可知，下次也想去可推知这次旅行很让人激动，sounds是系动词，后接形容词作表语，修饰物用exciting。故选C。
47．B
【解析】句意：我弟弟只有五岁。他太小了，无法回答这样的一个难题。
考查动词不定式作结果状语。so…that如此……以至于……；too…to太……以至于不能做……；to…too去……太……；such…that如此……以至于……。根据“My brother is only five years old.”可知，他年纪小，因此不能回答难题，young为形容词，因此应用too+adj./adv.+to do sth表示“太……以至于不能做……”。故选B。
48．C
【解析】句意：乘出租车太贵了。我们改乘地铁去那儿吧。
考查副词。once一次，曾经；already已经；instead代替。根据“It’s too expensive to take a taxi.”可知，乘出租车太贵了，说话者提议改乘地铁，用instead表示替代之意。故选C。
49．A
【解析】句意：作为学生，我们把再多注意力放在发音上也不为过，因为它在学习英语上发挥着很重要的作用。
考查动词辨析。can’t不能；mustn’t不得；needn’t不需要；shouldn’t不应该。根据“it plays an important role in learning English”可知，发音起到重要的作用，因此花再多的关注也不为过，用can’t…too表示“再……也不为过”。故选A。
50．B
【解析】句意：——你不应该花太多时间玩电脑游戏。——谢谢你，但我不知道如何以更好的方式去生活。
考查固定句型以及介词短语。sb spend+时间+(in)doing sth“某人花费时间做某事”。第一空内应填入动词ing形式。in用，以；on在上面。in a better way“以更好的方式”。故选B。
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