—Guess what! I have got A for my term paper.
—Great! You read widely and put a lot of work into it.
A. must
B. should
C. must have
D. should have
网友回答
A. must
B. should
(答案→)C. must have
D. should have
解析：本题考查情态动词的用法。由“have got A”可知是对过去发生事情的推测，故用“情态动词+have done”结构。must have done表示“必定做过某事”，符合题意。