These viruses, if ________ in, can result in illness or even death.
A．breathingB．breathedC．breatheD．to breathe
B

試題分析：考查狀語(yǔ)從句的省略式，英語(yǔ)中如果主從句的主語(yǔ)一致，可以省略從句的主語(yǔ)和be動(dòng)詞，if breathed in="if" these viruses are breathed，句意：如果被吸入，這些病毒會(huì)導(dǎo)致疾病或死亡。選B。
點(diǎn)評(píng)：做這種題目可以用還原法做題，先把主語(yǔ)和be動(dòng)詞加上，再判斷是主動(dòng)還是被動(dòng)。句意通順才行。
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