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    we are doing has never been done before. A. That B. Which C. whether D. What 【查看更多】

     

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    ______ we are doing has never been done before.

        A. That               B. What

    C. Which              D. Whether

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    _______ we are doing has never been done before.

        A. That               B. What

        C. Which              D. Whether

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    _______ we are doing has never been done before.

    A. That　　　　　　　　　　 B. What

    C. Which　　　　　　　　　　 D. Whether

     

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    ____we are doing has never been done before.
    A. That  　　 B. Which　　　  C. whether　　　　　  D. What

     

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    _______ we are doing now has never been done before.?

    A. That B. What?

    C. Which D. Whether?

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