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

C


解析:

本題考查的是非謂語動詞。be believed to do 為習慣性搭配。the flu 與cause 為動賓關(guān)系,所以用被動語態(tài)。

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