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    You were out enjoying yourself when you . A. must have studied B. would have studied C. should be studying D. ought to have been studying 【查看更多】

     

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    You were out enjoying yourself when you ________.

           A. must have studied            B. would have studied

           C. should be studying           D. ought to have been studying

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    You were out enjoying yourself when you ________.

           A. must have studied            B. would have studied

           C. should be studying           D. ought to have been studying

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    You were out enjoying yourself when you _________.

    　 A. must have studied　　 B. would have studied

    　 C. should be studying　　　 D. ought to have been studying

     

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    You were out enjoying yourself when you ________．

    [　　]
    A．

    must have studied

    B．

    would have studied

    C．

    should be studying

    D．

    ought to have been studying

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