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The flu is believed _____ by viruses inside the human nose and throat.

A. causing
B. being caused
C. to be caused
D. be have caused
C
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The flu is believed _____ by viruses inside the human nose and throat.
[     ]
A. causing
B. being caused
C. to be caused
D. be have caused

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科目：高中英語 來源： 題型：

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

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

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The flu is believed _____ by viruses that like to be reproduced in the cells inside the human nose and throat.

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