Weknowthatasmileisusuallyasignthatpeoplefeelfriendlyand... 国语站 题库 2.36W 大中小设置文字大小 问题详情:We know that a smile is usually a sign that people feel friendly and happy,but _____ we don't know who the new person is?( )A.what if B.how come C.what about D.why not【回答】A知识点:固定句型题型:选择题 TAG标签:#