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
C. would have done
D. can have done
解析：考查情态动词用法。情态动词+have done是对过去发生的情况进行说明；情态动词+动词原形是对现在的情况进行说明。本题非常清楚是对过去情况进行的说明，所以排除AB。D项通常用语疑问句。C项意为：会做某事（非常肯定）；句意：我只是做了任何人在我的位置上都会做的事情。
