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    2．- 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 【查看更多】

     

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    — 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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