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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. 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 【查看更多】

     

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