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?
人气：366 ℃ 时间：2020-02-05 19:21:55
解答
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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