A. | to be caused | B. | to have caused | C. | being caused | D. | causing |
分析 人们相信流感是由在人类鼻腔和喉腔细胞内繁殖的病毒引起的.
解答 答案:A.
名词+be+believed/said/reported+不定式"相当于"It is believed/said/reported that…",是一个常用句型.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.
点评 本句可以变换成It is believed/said/reported that the flu is caused by viruses that like to reproduce in the cells inside the human nose and throat.
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