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    29．People around the world Christmas trees ever since 1510. A．decorated B．have decorated C．have been decorated D．have been decorating 【查看更多】

     

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    People around the world         Christmas trees ever since 1510.

           A．decorated                                            B．have decorated    

           C．have been decorated                             D．have been decorating

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    People around the world ________ Christmas trees ever since 1510．

    [　　]

    A．decorated

    B．have decorated

    C．have been decorated

    D．have been decorating

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