急There are many people downstairs .What do you think_____?A.to happen B.happening C.is happened D.has happened 选哪一个?为什么?

分类: 作业答案 • 2021-12-19 11:45:12

问题描述：

急There are many people downstairs .What do you think_____?
A.to happen B.happening C.is happened D.has happened 选哪一个?为什么?

答