If ____ in, viruses can result in illness or even death.

A. breathe B. breathing

C. breathed D. to breathe

 

C

【解析】

試題分析:句意：如果被吸進體內(nèi)，病毒能夠導致疾病甚至死亡。此處是“連詞+非謂語”結構做狀語，句子主語viruses和breathe之間是動賓關系，故用過去分詞表示被動，選C。

考點：考查非謂語動詞。

 

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