The flu is believed ______byviruses that like to reproduce in the cells ins

分类: 作业答案 • 2021-12-23 10:53:38

问题描述：

The flu is believed ______byviruses that like to reproduce in the cells ins
A.causing B.being caused C.to be caused D.to have caused
why?

答

C,这是 sth is believed to be done 的句型,意思是“据信...”,而流感是被病毒引起的,所以是被动语态.
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