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--Why are your eyes so red? You _______ have slept well last night.
A.can'tB.mustn'tC.needn'tD.won't
A

试题分析:考查情态动词:句意:你眼睛怎么这么红?你昨晚一定没睡好吧。---我熬夜写报告。根据why are your eyes so red?可以得出对方一定没有睡好,故用can’t(不可能)。Mustn’t(禁止,不准);needn’t(不必);won’t(不会)。选A。
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