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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:本題考查非謂語動詞用法!懊~+be+believed/said/reported+不定式”相當于“It's believed/said/reported that…”,可以看作是一個句型。flu與cause之間是一種動賓關系,所以應該用動詞不定式的被動式,答案為C。句意:流感被認為是由在人類鼻腔和喉腔細胞內繁殖的病毒引起的。
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