问题补充：
(·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
B. mustn
C. needn
D. won
答案：
(答案→)A. can
B. mustn
C. needn
D. won
解析：A考查情态动词的用法。句意：“你的眼睛为什么那么红啊？昨晚你不可能睡得很好。”“是的，我熬到很晚写一篇报告。”can have done指过去不可能做……。
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