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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+过去分词+不定式句型中,如果不定式所表示的动作在谓语动词后面发生,动词不定式要用一般式。

 

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