Unless tospeak,youshouldremainsilentattheconference... 国语站 题库 3.19W 大中小设置文字大小 问题详情:Unless to speak, you should remain silent at the conference.A.invited B.inviting C.being invited D.having invited【回答】A知识点:非谓语动词题型:选择题 TAG标签:#