1. The worrying boy tried many times to crawl over the fence after evening class,—each time by the guards in our school.

A. being caught

B. only to be caught C. caught

D. having been caught

2. The party was a success, but I thought it a pity not—you.

A. invite

B. to invite

C. inviting

D. to have invited

3. I haven't written to him, for I don't know—the letter.

A. how begin

B. to how begin

C. how to begin

D. how to begin write

4. Everyone here will thank the firefighters for the things they have done to prevent fires—the environment safer.

A. make

B. to making

C. to make

D. from making

5.一Hello, Jack, we re going to see our teacher tomorrow, would you like to go with us?

一Really?

A. I'd like :

B. I'd love

C. I like

D. I'd love to.

6. In some teachers' opinion, the harder a student studies, the more questions he thinks of

A. asking

B. being asked

C. to ask

D. asked

[答案与解析]

1. B.不定式的被动语态作状语。表示没有预料到的情况或结果;句意为“晚校后，那焦虑的孩子多次要爬墙，结果每次都被学校门卫逮住。”

2. D.本题考查不定式的否定结构作宾语。动词invite 发生在谓语动词thought之前，应用完成时，故答案为D。句意为“舞会很成功，但我认为没邀请你很遗憾。

3.C。句意为“我还没给他写信，因为我不知道如何开头。”疑问词+不定式短语，其作用相当于一个名词性从句，常用在某些动词如te11, know, imagine, learn, decided, forget. remember, consider, understand等后面做宾语。

4. C。此题受定式思维的干扰，很容易误选为D.实际上，本题考查不定式作目的状语。句意为“这里的每个人将因为消防队员预防火灾使环境更安全所做的事情而感激他们，”

5.D。本题考查不定式的省略。为避免重复，用to来替动词不定式或不定式短语。句意为“杰克，我们明天要去看老师，你一起去吗?”“真的?我想去。”

6.C。本题考查不定式作后置定语，用主动形式表被动意义。句意为“在一些老师看来，学生学习越用功，他想起要问的问题就越