The flu is believed ____by viruses that like to reproduce in the cells inside the human nose and thr_刷题宝

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：to have caused

上一题下一题 0.0难度选择题更新时间:2018-07-17 03:40:31

答案(点此获取答案解析）

C

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