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

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：既然已经通过考试，自然是以前阅读广泛﹑用心学习了，故在C﹑D中进一步选择，D项表示本应当，因不附题意而被舍去。