The flu is believed by viruses that like to reproduce in the cells inside the hu
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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?
试题答案
C
本题考查非谓语动词。在英语中表示“据说/传/知道……”的句型是It is said/reported/known that somebody/something...=Somebody/Something is said/reported/known to...;流感是被引起的,所以选C。