The flu is believed by viruses that like to reproduce in the cells inside the human nose and throat. A. causing B. being caused C. to be caused D. to have caused [解析]選C 根據(jù)flu和介詞by可知應(yīng)該用被動語 態(tài).所以排除A.D項.再根據(jù)is believed.可知C項為最佳 選項.因為sth. is believed / considere / thought是英語中 的一種常見句式. 【查看更多】

 

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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

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

 A. causing        B. being caused      C. to be caused       D. be have caused

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

A.causing                            B.being caused

C.to be caused                      D.to have caused

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

A. causing B. being caused?

C. to be caused D. be have caused?

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

A. to be caused                   B. to have caused               C. being caused                   D. causing

 

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