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    【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:——你的眼睛为什么那么红啊？昨晚你不可能睡得很好。——是的，我熬到很晚写一篇报告。本题考查情态动词用法。根据句意选A。

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