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    I the Christmas gift by mail because he came home during the Christmas holidays. A. ought to have sent B. couldn't have sent C. must have sent D. needn't have sent 【查看更多】

     

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     I __________ the Christmas gift by mail because he came home during the Christmas holidays.

    A. ought to have sent             B. couldn't have sent

    C. must have sent                D. needn't have sent

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