每日一练：职称英语考试卫生类每日一练(2018/6/20)
【单选题】
John is collaborating with Mary in writing an article
A cooperating B competing C combining D arguing
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每日一练：职称英语考试卫生类每日一练(2018/6/20)
【单选题】
John is collaborating with Mary in writing an article
A cooperating B competing C combining D arguing
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