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(2013·四川,5)—Why are your eyes so red?You________have slept well last night.
—Yeah,I stayed up late writing a report.

A.can'tB.mustn'tC.needn'tD.won't

A

解析考查情态动词。根据语境“眼睛那么红,昨晚不可能睡得很好”可知,此处考查情态动词can的否定式can't表推测,意为“不可能”。can't have done表示对过去的推测,意为“过去不可能……”。故选A。

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