---Sir I’m terribly sorry for not having handed in my homework on time but I have been v

问题补充：

---Sir, I’m terribly sorry for not having handed in my homework on time, but I have been very busy all these days.

---No excuse for it, but I drop it this time.

A. might

B. can

C. should

D. must

答案：

A. might

(答案→)B. can

C. should

D. must

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