—IsJasonallright?Helookssotire

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更新 2022-09-03
科目英语
题型单选题
难度中等
浏览 1377

—Is Jason all right? He looks so tired!
—Not sure. He __________ deep into the night yesterday. He's having an exam soon.

A．may have studied

B．should have studied

C．might study

D．must have been studying

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