Unit 1 How can we become good learners 语言能力把关练（含解析）人教版九年级英语全一册

Unit1 语言能力把关练
一、完形填空
People often ask me for suggestions about how to learn English. As for it, everyone is 1 . I’ll share
some of my experience.
One thing I can tell you is that, once you’ve started learning, you should try to form a 2 of thinking in English. If you see something when you’re riding your bike or walking down the street, just think about “ 3 would I say them in English ” At first, it might be with simple words or phrases, but later you should 4 longer phrases and sentences. Now I’m in America, and for most of 5 time, I would think in English and
speak it directly. It’s amazing how much this 6 .
For several years after I started learning, I was often afraid of talking with others in English 7 I didn’t want to make mistakes. Finally I got it over. And while traveling in America, I’d try to hang out with friends who couldn’t speak English, so that I’d have no choice 8 to speak English. And I also decided that if I said something stupid and other people laughed at me, then so be it ( 就 那 样 吧 ). After that, my English started
improving much more 9 .
Besides, it may be a good idea to ask 10 American friends to look at the way you’rewriting, and give
you some suggestions for improvement.
1 ．A ．interesting B ．difficult C ．different D ．similar
2 ．A ．method B ．thought C ．rule D ．habit
3 ．A ．How B ．When C ．Why D ．What
4 ．A ．think about B ．talk about C ．think over D ．talk with
5 ．A ．/ B ．a C ．an D ．the
6 ．A ．does B ．goes C ．helps D ．enjoys
7 ．A ．though B ．if C ．because D ．to
8 ．A ．and B ．but C ．or D ．so
9 ．A ．slowly B ．quickly C ．wisely D ．happily
10 ．A ．your B ．my C ．our D ．their
二、阅读还原 5 选 5
You just heard you would have a math test on Friday—the same day as your history test. Are they crazy How
will you get all your study done Don’t worry about it. 11
Start studying in school.
Good learning methods are developed in the classroom as you take notes. 12 Make sure your notes are
easy to read, and review.
13
When you sit down to study, think about how much time you want to spend on each subject. Most people can keep focused（专注） for about 45 minutes a time. After that you’ll probably want to take a short break. When your
45 minutes of studying are up. You can take a 15-minute break.
Study according to the type of test you’re taking.
Many teachers tell students what the format（总体样式）of an exam will be like. 14 For example. If you’re going to have multiple-choice questions（选择题） , you’ll pay more attention to studying facts and details.
15
Sometimes it can be useful to with your classmates or others in a group. In this way you can make sure that
your notes are correct and that you understand the subjects.
A ．Plan your study time.
B ．This can help you decide how you study.
C ．Set up a study group.
D ．Here is some advice for you.
E ．Note-taking is a way of remembering what you are taught or what you’ve read.
三、阅读单选
David: Well, I don’t know how you all feel, but I find English really difficult. There are just so many words to remember, and the language structures are so difficult to understand. My problem is that I can’t remember all the new words and I find long passages difficult to understand. I’m so worried. How can I improve my English
Tina: Don’t worry, David. I often use chants, songs and pictures to help me remember new words, and they’re quite useful. I also check the number of words I can remember each day. Then I’ll test myself again after one or two days. For very difficult words, I’ll review them again one or two weeks later. The important thing is to review the new words often.
Brian: For long passages, you should try to understand the general meaning and key points first. And for the language structures, the best way to remember them is to use them. Try to do more reading, listening, speaking and writing in English. The more you use them, the easier learning English will be.
Anne: As for me, I like to check my learning progress once a week. I usually make a list of things I do well and those I don’t. Then I’ll set my goals and work out a learning plan to achieve them. I find it very useful, and my English has improved a lot. By the way, I always reward myself when I achieve my goals.
Mrs. Smith: Never give up, David. Learning English is hard, but your English is already very good. I’m sure you’ll find a learning method that suits you. Remember, we’re all good at different things and we can all make a difference!
16 ．Which of the following is NOT David’s problem
A ．He can’t remember so many new words. B ．He can’t get high marks in exams.
C ．Language structures are too difficult for him. D ．He can’t understand long passages.
17 ．How to understand a long passage according to Brian
A ．To understand the general meaning only. B ．To use them in daily life.
C ．To do more exercises in English. D ．To understand the general meaning and key points.
18 ．What is Anne likely to do when she achieves her goals
A ．She will sing a song. B ．She will study even harder.
C ．She will be praised by her parents. D ．She will buy herself a gift.
19 ．The underlined word in the passage can be replaced by .
A ．corrects B ．improves C ．is right for D ．is good for
20 ．Mrs. Smith said the words to .
A ．teach David how to remember new words B ．share her experience of learning English
C ．encourage David in learning English D ．tell others that she is good at many things
四、补全对话 5 选 5
根据对话内容，从 A 到 F 选项中，选出能填入空白处的最佳选项，每个选项只使用一次，选项中有一项为
多余项。
A: Welcome to the English club. May I ask you some questions
B: Of course.
A: 21
B: No It’s too hard to understand spoken English.
A: 22 Do you lean English that way
B: Yes, I do. It helps to write English every day.
A: Have you ever studied with a group
B: Yes. I have. 23
A: Do you have conversations with friends in English
B: Oh, yes. 24
A: What about reading aloud to practice pronunciation
B: I do that sometimes. I think it helps. I often look up new words in a dictionary.
A: 25
A ．That’s a great idea!
B ．Do you learn English by watching videos
C ．What about keeping a diary in English
D ．I don’t think so.
E ．I really improve my speaking skills.
F ．I’ve learned a lot that way.
五、阅读判断
Are you learning a foreign language Do you know what a successful language learner should do
First of all, successful language learners are independent learners. They do not depend on books or teachers.
They discover their own ways to learn the language. They also look for clues ( 线索) and get their own ideas by
guessing. When they guess wrong, they try again. They try to learn from their mistakes.
Successful language learning is active learning, so successful learners do not wait for a chance to use the language. They look for chances. They find native speakers and ask them for help when they make mistakes. They will try their best to communicate with others. They are not afraid to repeat what they heard or to say strange
things.
Finally, successful language learners are learners with a purpose (目的). They want to learn the language in
order to communicate with foreigners and learn about their lives, their culture and so on.
阅读下面一篇短文，判断文后各小题的正（A）误（B）。
26 ．Successful language learners depend on books and teachers.
27 ．According to the author, it is worth guessing even if it is wrong.
28 ．Successful language learners wait for native speakers to use the language.
29 ．Learning a foreign language can help learn about another culture.
30 ．If you learn with a purpose, you will be a successful language learner.
六、多任务混合阅读
Look around when you’re on a subway. What is the most popular time-killing(消磨时间的) activity In China,
most people play on their smart phones. While in other countries, people often enjoy reading.
On average(平均), each Chinese person read less than eight books in 2018, according to a recent survey from the Chinese Academy of Press and Publication. But Chinese people ①/spend/ an average of 26 minutes on
WeChat Reading every day.
②在许多西方国家，人们在任何时间都会阅读。Even backpackers（背包客）enjoy reading books when they are having a break at the beach or relaxing from a hike. Reading books builds a bridge③/ b twi n/ our
lives and the unknown world.
Many hotels abroad also offer book-exchanges for visitors. Simply drop off your finished books and take those ones that other people left behind. In most US middle schools, teachers give students a reading list every few
weeks. ④Most books are easy to read, so students won’t lose their confidence of reading.
Good reading habits lead you to a lifelong love of books. In order to encourage people to read more. China is
planning to foster(培养)the habits of reading in its law. Although this has both good and bad sides,⑤ .
31 ．填写单词：根据文中① 、③两处音标填写单词。
①/spend/ ③/ b twi n/
32 ．将文中②处划线句子翻译成英语：
33 ．将文中④处划线句子翻译成汉语：
34 ．补全短文：从下面四个选项中，选出能填入文中⑤处划线部分的最佳选项。
A ．it can be seen as a way to foster one’s interest
B ．it can be seen as a way to build somebody up
C ．it can be seen as a way to develop one’s reading habits
D ．it can be seen as a way to improve one’s writing ability
35 ．What’s the purpose of having good reading habits according to the passage
七、短文选词填空
从方框内选择单词，并用其适当形式完成短文
good, lose, chance, use, other, three, able, much, pronounce, act
How can you improve your spoken English The first and 36 important thing is to believe in
yourself. You should always have confidence or you will never be able to speak English well. People who are more
confident will get more 37 to practice. And practice makes perfect.
Second, don’t be afraid of 38 face. You’re a student and you’re learning, so there is no need to worry about anything. No one is born with the 39 to speak any language better than others. You should always
be 40 in practice.
41 , pay attention to the meaning you’re expressing. There’s no problem that your 42 and
intonation ( 语调) can’t be as good as the local people because you are Chinese. Language is 43 for
communication. Therefore, you must know that the main purpose of learning English is to make yourself
understood and understand 44 .
You should believe that native speakers will not laugh at you, instead they will encourage you. If you are
brave enough, you’ll certainly be 45 at speaking English than before.
八、语法选择
Some students don’t seem to concentrate (集中注意力) on their studies very well. They don’t know how to
concentrate while 46 . Here are several things that can help.
Exercise. Go for a walk in the morning after breakfast. If you like to do sports, you can do for one 47 two hours every day. If you have joined a sports club, go in the evening. This 48 help you have a goodnight
sleep.
Take breaks. Taking breaks is a good way 49 concentrate on your studies. Take a break when you feel
50 . Different people take breaks in different ways. You can walk around the house or make a cup of tea.
Eat 51 fruit and drink more water. Eating fruit and drinking water are usually very good for
studying. They can make you feel 52 again and then help you concentrate 53 .
Be away from distractions (干扰). 54 sure that you are away from your mobile phone, computer and TV. It is okay if you need the sound of music. 55 you are easily distracted by little things, keep your head
down so you see only the paper in front of you.
46 ．A ．study B ．studying C ．to study D ．in study
47 ．A ．and B ．or C ．so D ．but
48 ．A ．can B ．need C ．must D ．should
49 ．A ．help B ．helping C ．helps D ．to help
50 ．A ．tiring B ．tired C ．relaxing D ．relaxed
51 ．A ．little B ．less C ．many D ．more
52 ．A ．live B ．living C ．alive D ．lively
53 ．A ．easier B ．more easily C ．hard D ．harder
54 ．A ．Make B ．Making C ．To make D ．Made
55 ．A ．Because B ．If C ．Although D ．Unless
参考答案：
1 ．C 2 ．D 3 ．A 4 ．A 5 ．D 6 ．C 7 ．C 8 ．B 9 ．B 10 ．A
【导语】本文主要结合作者自身学英语的经历给出了学习英语的一些建议。
1 ．句意：至于它，每个人都不一样。
interesting 有趣的； difficult 困难的； different 不同的； similar 相似的。根据“As for it, everyone is…”以及上
下文可知，每个人都是不一样的。故选 C。
2 ．句意：我可以告诉你的一件事是， 一旦你开始学习，你应该试着养成用英语思考的习惯。
method 方法； though 虽然； rule 规则； habit 习惯。 form a habit of …意为“养成一个…… 的习惯” ，因此
“habit”意为“ 习惯” ，符合语境。故选 D。
3 ．句意：如果您在骑自行车或走在街上时看到某些东西，请想一想“我该怎么用英语说它们？
How 怎样； When 什么时间； Why 为什么； What 什么。根据“ …would I say them in English ”可知，此处表
示“我如何用英语说它们呢？ ,应用 how。故选 A。
4 ．句意：起初，它可能是简单的单词或短语，但后来你应该考虑更长的短语和句子。
think about 考虑；talk about 讨论；think over 仔细考虑；talk with 谈话。根据“At first, it might be with simple words
or phrases,”可知，但后来你应该考虑更长的短语和句子。故选 A。
5 ．句意：现在我在美国，大部分时间，我会用英语思考并直接说出来。
/不填；a 一个，修饰辅音音素开头的单词；an 一个，修饰元音音素开头的单词；the 定冠词。 most of the time
意为“大多数时候” ，应用定冠词“the”。故选 D。
6 ．句意：令人惊讶的是这有多大帮助。
does 做； goes 去； helps 帮助； enjoys 享受。 this 指代上文提到的学习方法，而这些方法很有帮助，因此用
“helps”。故选 C。
7 ．句意：在我开始学习之后的几年里，我经常害怕用英语与别人交谈，因为我不想犯错误。
though 虽然； if 如果； because 因为； to 向。分析前后分句的关系可知，后一分句表示的是原因，因此此处
用 because。故选 C。
8 ．句意：在美国旅行时，我会尝试和不会说英语的朋友一起出去玩，这样我就别无选择，只能说英语。 and 和； but 但是； or 或者； so 所以。 have no choice but to do sth.意为“ 除了做某事别无选择” 。故选 B。
9 ．句意：在那之后，我的英语开始进步得更快了。
slowly 慢慢地；quickly 快速地；wisely 明智地；happily 开心地。根据“After that, my English started improving
much more…”可知，我的英语开始进步得更快了。故选 B。
10 ．句意：此外，请你的美国朋友看看你的写作方式，并给你一些改进建议可能是个好主意。
your 你们；my 我的；our 我们的；their 他们的。根据后文“American friends to look at the way you’rewriting, and
give you some suggestions for improvement.”可知，此处指的是“你的美国朋友” ，应用“your”。故选 A。
11 ．D 12 ．E 13 ．A 14 ．B 15 ．C
【分析】本文主要介绍了学习的几个建议。
11 ．根据“Start studying in school.”以及“Study according to the type of test you’retaking.”可知，此处引出下文
的建议， D 选项“这里有一些建议给你。 ”符合语境。故选 D。
12．根据“Good learning methods are developed in the classroom as you take notes.”可知， 此处与记笔记有关， E
选项“记笔记是一种记住所教内容或所读内容的方法。 ”符合语境。故选 E。
13 ．根据“think about how much time you want to spend on each subject”可知，此处与做计划有关， A 选项“计
划好你的学习时间。 ”符合语境。故选 A。
14．根据“Many teachers tell students what the format of an exam will be like.”以及“For example. If you’re going to have multiple-choice questions, you’ll pay more attention to studying facts and details”可知，此处表示知道考试形
式的重要性， B 选项“这将帮助你决定如何学习”符合语境。故选 B。
15．根据“Sometimes it can be useful to with your classmates or others in a group.”可知， 此处表示与其他人一起
学习， C 选项“成立一个学习小组”符合语境。故选 C。
16 ．B 17 ．D 18 ．D 19 ．C 20 ．C
【导语】本文主要讲述了大卫在英语学习方面遇到了一些困难， 一些网友给他提供了一些建议。
16 ．细节理解题。根据第一栏可知，并没有提到大卫在考试中得不到高分，故选 B。
17．细节理解题。根据第四栏“For long passages, you should try to understand the general meaning and key points
first.” 以及选项可知，通过了解大意和重点来理解长文章。故选 D。
18．推理判断题。根据第四栏最后一句“By the way, I always reward myself when I achieve my goals.”可知， 她
会给自己买礼物。故选 D。
19．词义猜测题。根据“I’m sure you’ll find a learning method that suits you.”可猜知， suit 此处作动词， 意为“适
合；满足（某人）需要” ，此时与 be right for 同义。故选 C。
20 ．推理判断题。根据最后一栏的“ Never give up, David”可知， Mrs. Smith 主要是鼓励 David 继续努力学习
英语。故选 C。
21 ．B 22 ．C 23 ．F 24 ．E 25 ．A
【分析】这个对话是 A 询问 B 是通过什么方法学英语的。
21．根据下文No It’s too hard to understand spoken English.可知上文是Do you learn English by watching videos
你看录像学英语吗？故选 B。
22 ．根据 Do you lean English that way 及下文 Yes, I do. It helps to write English every day.可知，这里是 What
about keeping a diary in English 用英语记日记怎么样？故选 C。
23 ．根据上文 Have you ever studied with a group 及回答 Yes. I have 可知这里是 I’ve learned a lot that way. 我
从那里学到了很多东西。故选 F。
24．根据 Do you have conversations with friends in English 及 Oh, yes.可知下文是 I really improve my speaking
skills.我真得提高了我的说的技能。故选 E。
25 ．根据上文 I do that sometimes. I think it helps. I often look up new words in a dictionary.可知下文是 That’s a
great idea!那是一个好主意。故选 A。
【点睛】 1、通过阅读中心句快速掌握文章脉络
2、划出句子中的关键词
3 、 题干中通常会有指示性词汇
4、首次阅读中不确定的位置做个记号
在首次阅读的过程中如果不能确定某些单句是否与该段落相匹配，最好做个记号，以便第二次阅读时更有 针对性。第二次阅读的目的： 一是检查已初步确定的段落与单句是否确实匹配；二是完成第一遍阅读中尚
未解答的题目。
26 ．B 27 ．A 28 ．B 29 ．A 30 ．B
【导语】本文主要介绍了一个成功的语言学习者应该做什么。
26 ．细节理解题。根据“successful language learners are independent learners. They do not depend on books or
teachers”可知成功的语言学习者不依靠书本或老师，此句表述错误。故选 B。
27．推理判断题。根据“When they guess wrong, they try again. They try to learn from their mistakes”可知当他们 猜错时，他们会再试一次，他们试图从错误中吸取教训，所以即使是错的，也值得猜，此句表述正确。故
选 A。
28．细节理解题。根据“successful learners do not wait for a chance to use the language. They look for chances”可
知成功的学习者不会等待使用语言的机会， 他们寻找机会，此句表述错误。故选 B。
29 ．细节理解题。根据“They want to learn the language in order to communicate with foreigners and learn about
their lives, their culture and so on.”可知学习一门外语可以了解另一个文化，此句表述正确。故选 A。
30 ．推理判断题。根据“successful language learners are learners with a purpose”可知成功的语言学习者是有目 的的学习者，但是除此之外，还需要是独立的学习者以及积极的学习，所以只有目的，不一定能成为成功
的语言学习者，此句表述错误。故选 B。
31 ． spend between 32 ．In many western countries, people will read at any time. 33 ．大部分
书（籍） 都简单易读， 因此学生读起来不会失去阅读的信心。 34．C 35．Good reading habits lead you
to a lifelong love of books.
【分析】本文介绍了在地铁里：中国人大多数在玩智能手机。而在其他国家，人们常常喜欢阅读。据中国 新闻的调查显示，在 2018 年，平均每个中国人阅读的书籍不到 8 本。而每天花在微信上的时间为 26 分钟。
在西方国家，人们在任何时间都会阅读。文章最后介绍了良好的阅读习惯会让人们终生热爱书籍。
31 ．句子 But Chinese people ①/spend/ an average of 26 minutes on We Chat Reading every day. 的句意：但 中国人每天平均花在微信上的阅读是 26 分钟。由语境和所给的音标提示可知填：spend；由 every day 可知， 本题的时态为一般现在时，主语 Chinese people 是复数，因此谓语用动词原形。所以答案为： spend；句子 Reading books builds a bridge③/b twi n/ our lives and the unknown world 的句意：读书是我们生活与未知
世界之间的桥梁。由语境和所给的音标提示可知填： between；between ……and…… ：在 ……和……之间；
所以答案为： between。总之本题的答案为： ①spend ③between
32 ．汉译英。在许多西方国家：in many western countries；人们：people；在任何时间：at any time；阅读： read；由所给的汉语：在许多西方国家，人们在任何时间都会阅读。可知，本题的时态应该用一般将来时，
所以答案为： In many western countries, people will read at any time.
33 ．英译汉。 Most books：大部分书（籍）；be easy to do sth.：容易做某事；read：读；lose their confidence of reading：失去阅读的信心；students：学生；won’t：将不会。所以答案为：大部分书（籍）都简单易读，因
此学生读起来不会失去阅读的信心。
34 ．细节理解题。由本段的第一句话 Good reading habits lead you to a lifelong love of books. 良好的阅读习惯 会让你终生热爱书籍。可知， 本段主要谈论了阅读习惯的养成， 结合所给的选项可知， 应该选择 it can be seen as a way to develop one’s reading habits 它可以被看作是培养一个人阅读习惯的一种方法。符合语境。故选 C。
35．推理判断题。题干的意思是：根据这篇文章， 养成良好的阅读习惯的目的是什么？根据 Good reading habits
lead you to a lifelong love of books. 可知， 良好的阅读习惯会让你终生热爱书籍。故答案为 Good reading habits
lead you to a lifelong love of books.
36 ．most 37 ．chances 38 ．losing 39 ．ability 40 ．active 41 ．Third 42 ．pronunciation
43 ．used 44 ．others 45 ．better
【导语】本文主要讲述了如何提高英语口语的建议。
36 ．句意：首先也是最重要的事情是相信自己。由空格前的 The first 可知，此处表示“第一也最重要的事”，
important 的最高级是在其前面加 most ，故用 much 的最高级形式。故填 most。
37 ．句意：越自信的人，就越有机会练习。根据常识可知，越自信的人得到的机会越多，故 chance 符合语
境，再由 more 可知，此处应填名词复数形式。故填 chances。
38 ．句意：第二，不要怕丢脸。 lose face 意为“丢脸” ，介词后用动名词形式。故填 losing。
39 ．句意：没有人天生就能够比其他人更好地讲任何一种语言。 born with the ability to do sth.意为“天生具有
做某事的能力” 。故填 ability。
40 ．句意：您应该始终在实践中保持活跃。 be active in sth.意为“在某方面很活跃” 。故填 active。
41 ．句意：第三，注意你所表达的意思。根据语篇结构可知，此处表示“第三” 。故填 Third。
42 ．句意：没有问题，因为你是中国人，所以你的发音和语调不如当地人。此处与 intonation 对应，故应填
pronounce 的名词形式 pronunciation。故填 pronunciation。
43 ．句意：语言是用来交流的。此处用被动语态，应用 use 的过去分词形式“used”。故填 used。
44 ．句意：因此，你要知道，学习英语的主要目的是让自己被理解和理解他人。 understand others 意为“理解
其他人” 。故填 others。
45 ．句意：如果你足够勇敢，你肯定会比以前更擅长说英语。由句后的 than before 可知，用比较级，结合
语境可知填 better。故填 better。
46 ．B 47 ．B 48 ．A 49 ．D 50 ．B 51 ．D 52 ．C 53 ．B 54 ．A 55 ．B
【导语】本文主要介绍了一些可以帮助学生集中注意力的方法。
46 ．句意：他们不知道如何在学习时集中注意力。
study 学习； studying 动名词或现在分词； to study 动词不定式； in study 在研究中。分析句子可知，此处从
句中省略了 they are，此处用现在分词和 be 动词构成进行时。故选 B。
47 ．句意：如果你喜欢做运动，你可以每天做一两个小时。
and 和； or 或者； so 所以； but 但是。 one or two hours“一两个小时” 。故选 B。
48 ．句意：这可以帮助你睡个好觉。
can 能；need 需要；must 必须；should 应该。根据“This...help you have a goodnight sleep”可知是能够帮助你
睡好觉。故选 A。
49 ．句意：休息是帮助你专注于学习的好方法。
help 帮助，动词原形；helping 动名词或现在分词；helps 动词单三；to help 动词不定式。此处作定语修饰名
词 way，用动词不定式。故选 D。
50 ．句意：感到疲倦时休息一下。
tiring 令人劳累的； tired 劳累的； relaxing 令人放松的； relaxed 放松的。根据“Take a break when you feel”可
知感到累的时候要休息，修饰人用形容词 tired。故选 B。
51 ．句意：多吃水果，多喝水。
little 少的，修饰不可数名词；less 更少，修饰不可数名词；many 很多，修饰可数名词复数；more 更多，修
饰可数名词复数或不可数名词。根据“Eating fruit and drinking water are usually very good for studying”可知吃
水果对学习有好处，所以要多吃水果；根据“drink more water”可知此处用比较级形式 more 。故选 D。
52 ．句意：它们可以让你重新感到活力，然后帮助你更轻松地集中注意力。
live 住，动词原形；living 动名词或现在分词；alive 活着的，有活力，形容词；lively 活泼的。根据“They can
make you feel”可知吃水果和喝水能让你重新充满活力， feel alive“感到充满活力” 。故选 C。
53 ．句意：它们可以让你重新感到活力，然后帮助你更轻松地集中注意力。
easier 更容易的，形容词比较级；more easily 更容易地，副词比较级；hard 难的，形容词原形；harder 更难，
形容词比较级。此处修饰动词 concentrate ，用副词形式，且此处表示“更容易集中注意力” 。故选 B。
54 ．句意：确保你远离手机、电脑和电视。
make 制作，动词原形；making 动名词或现在分词；to make 动词不定式；made 动词过去式或过去分词。句
子是祈使句，以动词原形开头。故选 A。
55 ．句意：如果你很容易被小事分散注意力，请低下头，这样你就只能看到你面前的纸张。
because 因为；if 如果；although 虽然；unless 除非。 “you are easily distracted by little things”是“keep your head
down so you see only the paper in front of you”的肯定条件，用 if 引导条件状语从句。故选 B。