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    24．Three-fourth of the surface of the earth sea. A. is B. are C. were D. has been 【查看更多】

     

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    Three-fourth of the surface of the earth ________ sea.

    A. is

    B. are

    C. were

    D. has been

     

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    Three-fourth of the surface of the earth ________ sea.

    A. is

    B. are

    C. were

    D. has been

     

    查看答案和解析>>


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