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  3. The flu is believed______by viruses that like to reproduce in the cells inside the human nose and throat.

The flu is believed______by viruses that like to reproduce in the cells inside the human nose and throat.

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问题 The flu is believed______by viruses that like to reproduce in the cells inside the human nose and throat.
选项 A、cause
B、being caused
C、to be caused
D、to have caused
答案C
解析
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