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    They want to develop a kind of dog-friendly food , will help dog owners cool down their pets. A. who B. what C. which D. whether 【查看更多】

     

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    They want to develop a kind of dog-friendly food, ________ will help dog owners cool down their pets．

    [　　]
    A．

    who

    B．

    what

    C．

    which

    D．

    whether

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