Weknowthatasmileisusuallyasign 国语站 题库 2.22W 大中小设置文字大小 问题详情: We know that a smile is usually a sign _____ people feel friendly and happy, but _____ we don’t know who the new person is? A. that; what if B. when; what C. when; how about D. if; how【回答】A知识点:连词题型:选择题 TAG标签:#