(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

解析考查情態(tài)動詞。根據(jù)語境“眼睛那么紅，昨晚不可能睡得很好”可知，此處考查情態(tài)動詞can的否定式can't表推測，意為“不可能”。can't have done表示對過去的推測，意為“過去不可能……”。故選A。

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