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    9、         your paper carefully, some mistakes could have been avoided.

    A．If you had checked                                     B．If you have checked

    C．Having checked                                          D．Check

    9、A

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              your paper carefully, some mistakes could have been avoided.

    A．If you had checked  B．If you have checked

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    科目：高中英语 来源： 题型：

             your paper carefully, some mistakes could have been avoided.

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