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    22．Using renewable energy sources is a simple idea, but we find it hard to put into practice． A．one B．what C．which D．that 【查看更多】

     

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    Using renewable energy sources is a simple idea, but ______ we find it hard to put into

    practice.

           A. one    B. what        C. which          D. that

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    Using renewable energy sources is a simple idea, but ________ we find it hard to put into practice．

    A．one         B．what          C．which          D．that

    查看答案和解析>>

    Using renewable energy sources is a simple idea, but ________ we find it hard to put into practice.

    A．one                 B．what          C．which       D．that

    查看答案和解析>>


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