—How did she get infected?
—She the viruses without any protection．
A. exposed to
B. had exposed to
C. was exposed to
D. been exposed to
网友回答
A. exposed to
B. had exposed to
(答案→)C. was exposed to
D. been exposed to
解析：考察固定搭配。固定搭配expose sb to sth使某人暴露在….之下；接触….；转换为be exposed to…接触…；句义：—她是怎么被感染的？—没有任何保护就直接接触了病毒。故C正确。