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The flu is believed _______ by viruses that like to reproduce in the cells inside the human nose an

题目简介

The flu is believed _______ by viruses that like to reproduce in the cells inside the human nose an

题目详情

The flu is believed _______ by viruses that like to reproduce in the cells inside the human nose and throat.

A．causing	B．being caused
C．to be caused	D．be have caused

题型：单选题难度：中档来源：不详

答案

C

此题考查非谓语结构。在英语中表示“据说/传/知道……” 的句型是It is said/reported/known that sb./sth.="Sb./Sth." is said/reported/known to...；流感是被引起的，所以选C项。

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