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

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：句意:--谢谢你在我处于困境时的帮助。--不客气，我仅仅做了其他的人如果再我的位置也能做的事情。这里是虚拟语气，假设其他的人在我的位置其他的人也会这样去帮助你，而这里实际是我帮助了你，这是对过去的虚拟，相当于if anyone else had been in my place,they would have helped you.故选C。