－－－Sorry, Professor Smith. I didn't finish the assignment yesterday. －－－Oh, you______
---Sorry, Professor Smith. I didn't finish the assignment yesterday.
---Oh, you_______ have done it as yesterday was the deadline.
A. must
B. mustn't
C. should
D. shouldn't
此处表示和过去事实相反的情况，应该用should + have + 过去分词。本来应该做，而未做
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