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    He has two sons, work as chemists. A. two of whom B. both of whom C. both of which D. all of whom 【查看更多】

     

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    He has two sons, _____ work as chemists.   
    [     ]
    A. two of whom  
    B. both of whom  
    C. both of which  
    D. all of whom

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    He has two sons, __________ work as chemists.

    A. two of whom　 B. both of whom 　 C. both of which 　　 D. all of whom

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    He has two sons, ________ work as chemists．

    [　　]

    A．two of whom

    B．both of whom

    C．both of which

    D．all of whom

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