A. | to be caused | B. | to have caused | C. | being caused | D. | causing |
分析 人們相信流感是由在人類鼻腔和喉腔細(xì)胞內(nèi)繁殖的病毒引起的.
解答 答案:A.
名詞+be+believed/said/reported+不定式"相當(dāng)于"It is believed/said/reported that…",是一個(gè)常用句型.flu與cause之間是一種動(dòng)賓關(guān)系,所以應(yīng)該用動(dòng)詞不定式的被動(dòng)式,選A.
點(diǎn)評(píng) 本句可以變換成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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