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

試題分析:句意：如果被吸進(jìn)體內(nèi)，病毒能夠?qū)е录膊∩踔了劳�。此處是“連詞+非謂語(yǔ)”結(jié)構(gòu)做狀語(yǔ)，句子主語(yǔ)viruses和breathe之間是動(dòng)賓關(guān)系，故用過(guò)去分詞表示被動(dòng)，選C。
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