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    (1) is well-known that Antarctica is difficult to reach. (2) is well-known, Antarctica is difficult to reach. (3) is well-known is that Antarctica is difficult to reach. A. It B. Which C. What D. AS 【查看更多】

     

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     ________is well-known is that Antarctica is difficult to reach.
    A. What      B. It           C. As             D. which

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    ________ is well-known is that Antarctica is difficult to reach．

    [　　]

    A．What

    B．It

    C．As

    D．which

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