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    I’ve worked in this school twenty years. A. since B. for C. after D. when 【查看更多】

     

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    I've worked in this school         _ twenty years.
    [     ]
    A. since      
    B. for      
    C. after      
    D. when

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    I’ve worked in this school ________ twenty years．

    [　　]

    A．since

    B．for

    C．after

    D．when

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