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
解析:可联系答.案.网客服索取。