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    The world’s supplies of coal gradually up with the development of modern technology. A. is; used B. are being; used C. has; used D. have been; using 【查看更多】

     

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     The world’s supplies of coal _______ gradually _______ up with the development of modern technology.

    A. is; used            B. are being; used  C. has; used     D. have been; using

     

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