----Thank you very much for giving me a hand when I was in trouble.----Don’t mention it

问题补充：

----Thank you very much for giving me a hand when I was in trouble.

------Don’t mention it. I only did what anyone else in my place.

A. must do

B. might do

C. would have done

D. can have done

答案：

A. must do

B. might do

(答案→)C. would have done

D. can have done

解析：考查情态动词用法。本题是对过去所发生情况的说明，所以使用情态动词+have done;句意：—非常感谢你在我有麻烦的时候帮我忙。