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

試題分析：考查狀語從句的省略式，英語中如果主從句的主語一致，可以省略從句的主語和be動詞，if breathed in="if" these viruses are breathed，句意：如果被吸入，這些病毒會導(dǎo)致疾病或死亡。選B。
點(diǎn)評：做這種題目可以用還原法做題，先把主語和be動詞加上，再判斷是主動還是被動。句意通順才行。
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