It is not a good habit in public places. A. chewing gum B. to chew gum C. to chew gums D. ——青夏教育精英家教网—

摘要： It is not a good habit in public places. A. chewing gum B. to chew gum C. to chew gums D. chew gums

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It is not a good habit ________ in public places．