题目内容

--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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