The flu is believed _____ by viruses that like to reproduce in the cells inside the human nose and throat. [ ]A. causing B. being causedC. to be caused D. b-高中英语-n多题

◎ 题干

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

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◎ 解析

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◎ 知识点

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