How did she get infected?Because she------theHow did she get infected?Because she------the viruses whitout any protection .A had exposed to B had been exposed to选B 为什么呐?

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How did she get infected?Because she------theHow did she get infected?Because she------the viruses whitout any protection .A had exposed to B had been exposed to选B 为什么呐?
How did she get infected?Because she------the
How did she get infected?
Because she------the viruses whitout any protection .
A had exposed to B had been exposed to
选B 为什么呐?

How did she get infected?Because she------theHow did she get infected?Because she------the viruses whitout any protection .A had exposed to B had been exposed to选B 为什么呐?
当然是选择a了 因为她在那时(过去时间点)已经接触到病毒了.过去的一段时间对过去时间点造成了影响.
属于过去完成时 exposed过去分词

被动啊