The flu is believed by viruses that like to reproduce in the cell inside the human nose and throat.A．causing B．being causedC．to be caused D．to have caused 题目和参考答案——青夏教育精英家教网—

题目内容

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

A．causing B．being caused

C．to be caused D．to have caused

【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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