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    精英家教网 > 高中英语 > 题目详情
    —Why are your eyes so red？You________have slept well last night.
    —Yeah，I stayed up late writing a report.                          (2013·四川，5)
    A．can’tB．mustn’t
    C．needn’t D．won’t
    A
    解析　句意为：——你的眼睛为什么这么红？你昨晚肯定没睡好。——是的，我熬夜写了一篇报告。本题考查情态动词表推测的用法。can’t have done意为“不可能做过”，表示对过去事情的否定推测，符合题意。mustn’t表示“禁止”；needn’t表示“没必要”；won’t表示“不愿意”，均不合题意。
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