C,這是 sth is believed to be done 的句型,意思是“據(jù)信...”,而流感是被病毒引起的,所以是被動(dòng)語(yǔ)態(tài).
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The flu is believed ______byviruses that like to reproduce in the cells ins
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?
A.causing B.being caused C.to be caused D.to have caused
why?
英語(yǔ)人氣：645 ℃時(shí)間：2020-02-05 19:21:55
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