The flu is believed ________ by viruses that like to reproduce in the cell inside the human nose and throat.

Acausing Bbeing caused

Cto be caused Dto have caused

 

C

【解析】 在“sb/sth is/was+過去分詞+不定式句型中,如果不定式所表示的動作在謂語動詞后面發(fā)生,動詞不定式要用一般式。

 

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