The flu is believed________ by viruses that like to reproduce in the cells inside the human nose and throat．


  1. A.
    causing
  2. B.
    being caused
  3. C.
    to be caused
  4. D.
    to have caused
C
解析：
思路
分析：本題考查非謂語(yǔ)動(dòng)詞用法。“名詞+be+believed/said/reported+不定式”相當(dāng)于“It's believed/said/reported that…”，可以看作是一個(gè)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，答案為C。句意：流感被認(rèn)為是由在人類鼻腔和喉腔細(xì)胞內(nèi)繁殖的病毒引起的。
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