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    He has two sons, and are college students. A. both of which B. both of whom C. both of them D. all of whom 【查看更多】

     

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    ①He has two sons, ________ are college students．

    ②He has two sons, and ________ are college students．

    A．both of which

    B．both of whom

    C．both of them

    D．both of it

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