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    It was not until that to prepare his lesson. A. did his father come in, the boy began B. his father came in, the boy began C. did his father come in, did the boy begin D. his father came in, did the boy begin 【查看更多】

     

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    It was not until ________ that ________ to prepare his lesson．

    [　　]

    A．did his father come in, the boy began

    B．his father came in, the boy began

    C．did his father come in, did the boy begin

    D．his father came in, did the boy begin

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