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    No one knows when such a custom first . A. formed B. came into being C. was come into being D. was forming 【查看更多】

     

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    No one knows when such a custom first ________.

    [     ]

    A. formed
    B. came into being
    C. was come into being
    D. was forming

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    .

     No one knows when such a custom first __________.

       A. formed                      B. came into being

    C. was come into being           D. was forming

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    .

    No one knows when such a custom first __________.

    A．formed

    B．came into being

    C．was come into being

    D．was forming

     

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