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If ____ in, the viruses can result in illness or even deaths.
A.breathedB.to breatheC.breathesD.is breathed
A
考察非谓语动词。Breath的逻辑主语是viruses,被动关系,所以选择breathed="the" viruses are breathed in,
句意为如果被吸入体内,这些病毒能致病或者致死。
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