The flu is believed________ by viruses that like to reproduc

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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.to have caused

答案C
思路分析：本题考查非谓语动词用法.“名词+be+believed/said/reported+不定式”相当于“It's believed/said/reported that…”,可以看作是一个句型.flu与cause之间是一种动宾关系,所以应该用动词不定式的被动式,答案为C.句意：流感被认为是由在人类鼻腔和喉腔细胞内繁殖的病毒引起的.

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