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    People plant trees to help protect our world. A. millions B. millions of C. million of D. million 【查看更多】

     

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    People plant _________ trees to help protect our world.

    A. millions             B. millions of         C. million of           D. million

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    People plant ________ trees to help protect our world．

    [　　]

    A．millions of

    B．millions

    C．million of

    D．million

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