1． What are you doing?

I am frying to open the door,but it__ open.

a. is not able to b. won’t c. shan’t d. may not

2. I know him __ a good football player while in college.

a. was b. being c. to be d. fo have been

3. Is this factory __ your father used to work as an engineer ?


a. where b. which c. in which

请说明为什么?

1。b. won’t
考察情态动词will 的用法。
2。d. to have been
动词不定式中，要表达一个过去的动作，即用完成式。
3。a. where
this factory 是主语，where your father used to work as an engineer 是表语从句，从句中没有地点状语，所以用 where引导。

回答了你的几次问题后，我有个建议，你应该直接问你的英语老师，这样可以得到更详细的回答。我本人就是一个英语老师，我很想联系更多的知识来告诉你，可打字怎么能比语言描述更详细、更清楚呢！