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The flu is believed _____ by viruses that like to reproduce

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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
C
The flu is believed _____ by viruses that like to reproduce The flu is believed ______ by viruses that like to reproduce Cause的选择题The flu is believed _____ by viruses that like to r The flu is believed _____ by viruses that like to repro The bird flu is beleved 空 by viruses that like to reproduce The flu is believed ______byviruses that like to reproduce i the flu is believed to be caused by viruses that like to rep The flu is believed________ by viruses that like to reproduc 英语问题（单选题）1、The flu is believed ______ by viruses that like t the flu is believed to be caused by viruses 什么意思 解释下 谢谢 The flu is believed___by viruses that. The flu is believed to be caused by virus.