You look tired; you______ have stayed up late last night.

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问题 You look tired; you______ have stayed up late last night.

选项 A、should
B、must
C、would
D、may

答案B

解析 must have done意为“肯定做了某事”，表示对过去肯定的推测。句中提到“你看上去很疲劳”，所以“熬夜”这一行为是比较肯定的，应该用must。所以本题答案选B。

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