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    In this country, coal electricity. A．used to produce B．is used to produced C．is used to producing D．is used to produce 【查看更多】

     

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    In this country, coal      electricity.

    A．used to produce            B．is used to produced

    C．is used to producing                   D．is used to produce

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    In this country, coal ________ electricity．

    [　　]
    A．

    is used to produce

    B．

    is used to produced

    C．

    is used to producing

    D．

    used to produce

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