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    精英家教网 > 高中英语 > 题目详情
    The flu is believed ______ by viruses that like to reproduce in the cells inside the human nose and throat.
    A．to be causedB．to have causedC．being causedD．causing
    A

    试题分析：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。名词+be+believed/said/reported+不定式”相当于“It is 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，选A.
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