Question

(2007·上海)

--- 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

Answer 1

答案：C
解析：

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"必定做过某事"，符合题意。