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    Professor Backman took up scientific research for decades, and this is he devoted all his life to.☆考♂资♀源?网 ☆ A. which B. what C. where D. how 【查看更多】

     

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    Professor Backman took up scientific research for decades,and this is he devoted all his life to.

    A.which　　 B.what　 C.where　　 D.how

     

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    Professor Backman took up scientific research for decades, and this is ______ he devoted all his life to.

    A．which            B．what           C．where           D．how

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    Professor Backman took up scientific research for decades，and this is________he devoted all his life to.

    A．which　　　

    B．what

    C．where　　　

    D．how

     

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    Professor Backman took up scientific research for decades，and this is________he devoted all his life to.


    1. A.
      which
    2. B.
      what
    3. C.
      where
    4. D.
      how

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     Professor Backman took up scientific research for decades (几十年), and this is ______ he devoted all his life to.

    A. which               B. what             C. where            D. how

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