◎ 题干
There is a crowd of people in front of the house over there. What do you suppose
_____ there?
A.is happenedB.has happened
C.happeningD.to have happened
◎ 答案
查看答案
◎ 解析
查看解析
◎ 知识点
    根据n多题专家分析,试题“There is a crowd of people in front of the house over there. What do you suppose _____ there?A.is happenedB.has happenedC.happeningD.to have happened…”主要考查了你对  【一般现在时】【将来进行时】【过去完成进行时】【过去将来时的被动语态】  等知识点的理解和应用能力。关于这些知识点的“档案”,你可以点击相应的链接进行查看和学习。