There are many people downstairs.What do you think ______?A.to happen B.happening C.is happened D.has happened 选哪个?为什么?

分类: 作业答案 • 2023-01-16 20:36:12

问题描述：

答

选D.do you think 是插入语,去掉以后就可以看出句中缺谓语,happen是不及物动词,不能用被动语态.