【題目】—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:——你的眼為什么那么紅？昨晚你肯定沒睡好。——是的，我熬夜寫一篇報道。can't have done表示對過去的否定推測，“過去不可能做了某事”； mustn't表示“禁止,不允許”，后跟動詞原形，不跟have +過去分詞；needn't have done表示過去不必做某事（但卻做了）；won't不能用于對過去的推測。

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