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

試題分析：考查情態(tài)動詞：句意：你眼睛怎么這么紅？你昨晚一定沒睡好吧。---我熬夜寫報告。根據(jù)why are your eyes so red？可以得出對方一定沒有睡好，故用can’t（不可能）。Mustn’t（禁止，不準(zhǔn)）；needn’t（不必）；won’t（不會）。選A。
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