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

问题补充：

24．—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

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