The flu is believed ________ by viruses that like to reproduce in the cell inside the human nose and throat.
A．causingB．being caused
C．to be causedD．to have caused
C
　在“sb/sth is/was＋過去分詞＋不定式”句型中，如果不定式所表示的動(dòng)作在謂語動(dòng)詞后面發(fā)生，動(dòng)詞不定式要用一般式。
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