题目内容
---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
【答案】
C
考点:本题考查的是虚拟语气
解析:。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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