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If ____ in, viruses can result in illness or even death.
A.breatheB.breathing
C.breathedD.to breathe
C

试题分析:句意:如果被吸进体内,病毒能够导致疾病甚至死亡。此处是“连词+非谓语”结构做状语,句子主语viruses和breathe之间是动宾关系,故用过去分词表示被动,选C。
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