I still don't know what____to him.He ought to come now.(回答时告诉我为什么

分类: 作业答案 • 2021-12-28 14:38:29

问题描述：

I still don't know what____to him.He ought to come now.(回答时告诉我为什么
A.had happened B.was happened C.has happened D.happened

答

C 首先happen是不及物动词,没有被动形式,然后,主句是现在时,所以从句也一定是现在时的一种,这里现在时只有现在完成时