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  3. She looks tired. She ______ last night.

She looks tired. She ______ last night.

admin2008-01-17  58
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 语法分析题。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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