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    It is not a good habit in public places. A. chewing gum B. to chew gum C. to chew gums D. chew gums 【查看更多】

     

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    It is not a good habit ________ in public places．

    [　　]

    A．chewing gum

    B．to chew gum

    C．to chewing gum

    D．chew gum

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