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    9、— How could you make such a silly mistake?

    — I’m sorry．I ______ it before I handed in the paper．

    A．should check                                              B．could check

    C．must have checked                                           D．ought to have checked

    9、D

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    — How could you make such a silly mistake?

    — I’m sorry．I ______ it before I handed in the paper．

    A．should check                                              B．could check

    C．must have checked                                           D．ought to have checked

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