(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

考查情態(tài)動(dòng)詞。根據(jù)語(yǔ)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(dòng)詞can的否定式can't表推測(cè)，意為“不可能”。can't have done表示對(duì)過(guò)去的推測(cè)，意為“過(guò)去不可能……”。故選A。
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