Whyareyouhere?Youaresupposedto 国语站 题库 2.1W 大中小设置文字大小 问题详情： Why are you here? You are supposed to ______ the experiment in the lab. A. perform B. be performing C. have performed D. be performed【回答】B知识点：非谓语动词题型：选择题 TAG标签：#
