Mike looks so sleepy in the class; he ______ up last night.A、must stayB、should

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问题 Mike looks so sleepy in the class; he ______ up last night.

选项 A、must stay
B、should have stayed
C、must have stayed
D、is sure to stay

答案 C

解析情态动词题。表示对过去某一动作行为的确定的猜测用must have done这一句型。

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