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    34．It was not until 1999 regular radio broadcast began. A．while B．which C．that D．since 【查看更多】

     

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    It was not until 1999 ________ regular radio broadcast began.

    A．while        B．which        C．that         D．since

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    It was not until 1999 ________ regular radio broadcast began．

    [　　]

    A．while

    B．which

    C．that

    D．since

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