(2013·四川高考)—Why are your eyes so red? You ________ have slept well last night. —Yeah, I stayed up la...
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题目内容：
(2013·四川高考)—Why are your eyes so red? You ________ have slept well last night.
—Yeah, I stayed up late writing a report.
A．can't B．mustn't
C．needn't D．won't
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