单选题
You look tired today. You _____ last night.无
A、
should have stayed late
B、
must have stayed late
C、
might have stayed late
D、
could have stayed late
【正确答案】
B
【答案解析】
句意： 你今天看起来很疲惫， 昨天晚上一定熬夜了。 “must+have+done”表示对过去事情的肯定推测， 意思是“一定做过某事”。
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