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    精英家教网 > 高中英语 > 题目详情

    【题目】—Why are your eyes so red? You __________ have slept well last night.

    —Yeah, I stayed up late writing a report.

    A. can't B. mustn't

    C. needn't D. won't

    【答案】A

    【解析】句意:——你的眼为什么那么红？昨晚你肯定没睡好。——是的，我熬夜写一篇报道。can't have done表示对过去的否定推测，“过去不可能做了某事”； mustn't表示“禁止,不允许”，后跟动词原形，不跟have +过去分词；needn't have done表示过去不必做某事（但却做了）；won't不能用于对过去的推测。

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