If ____ in, the viruses can result in illness or even deaths.
A．breathedB．to breatheC．breathesD．is breathed
A
考察非謂語動(dòng)詞。Breath的邏輯主語是viruses，被動(dòng)關(guān)系，所以選擇breathed="the" viruses are breathed in,
句意為如果被吸入體內(nèi)，這些病毒能致病或者致死。
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