—Guess what! I have got A for my term paper. —Great! You read widely and put a lot of wor

问题补充：

—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

答案：

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。