Incommunication,asmileisusually 国语站 题库 3.16W 大中小设置文字大小 问题详情:In communication, a smile is usually __________ strong sign of a friendly and _______ open attitude.A. the, / B. a, an C. a, / D. the, an【回答】C知识点:冠词题型:选择题 TAG标签:#