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---Sorry, Professor Smith. I didn’t finish the assignment yesterday.
---Oh, you___________ have done it as yesterday was the deadline.
A.mustB.mustn’tC.shouldD.shouldn’t
C
本题考查的是虚拟语气。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。选C。
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