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：选A考查情态动词。句意：“你的眼睛为什么这么红？昨晚你不可能睡好觉。”“是的，我熬夜写一篇报告。”can have done表示对过去事情的推测，表示“不可能做过某事”。
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