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
C解析:句意是:“史密斯先生,对不起,我昨天没有完成作业。”“哎呀,昨天是最终期限,你本应该做完的。”此处表示过去应该做某事而实际上没有做,这是对对方表示责备或遗憾,故用should have done 形式。must have done 用来表示对已发生情况的猜测,意为“一定……了”。mustn't have done 是错误的表达形式,故先排除。shouldn't have done 表示本不应该做某事而实际上做了,这与题意相反。
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