She looks tired. She______last night.

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问题 She looks tired. She______last night.

选项 A、should have stayed up late
B、must have stayed up late
C、need have stayed up late
D、would have stayed up late

答案B

解析 情态动词完成式。根据题意和句子逻辑关系,这里表达一种对过去事情的推测,故B为正确答案。句意:她看起来很累,昨晚她一定熬夜了。
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