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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 【查看更多】

     

    题目列表(包括答案和解析)

    — 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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