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    15．--- Take a cigarette, please. --- No, thanks. It’s three years I smoked. A． before B．since C．after D．when 【查看更多】

     

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    －Take a cigarette, please．

    －No, thanks．It's three years ________ I smoked．

    [　　]
    A．

    before

    B．

    since

    C．

    after

    D．

    when

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