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    more countries can use natural energy in the future remains to be seen. A. Whether B. This C. who D. If 【查看更多】

     

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    _____more countries can use natural energy in the future remains to be seen.

       A. Whether   B. This   C. who   D. If

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    _____more countries can use natural energy in the future remains to be seen.

    A．Whether

    B．This

    C．who

    D．If

     

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    ________ more countries can use natural energy in the future remains to be seen．

    [　　]

    A．Whether

    B．This

    C．Who

    D．If

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