--How did she get infected?
--She ________the virus without any protection.
A.exposed toB.had been exposed toC.had exposed toD.was exposed to
D

試題分析:考查時(shí)態(tài)。句意:--她是怎樣被感染的?--她暴露于病毒中而未采取任何保護(hù)措施。be exposed to sth暴露于......,是固定搭配。排除A、C;這里沒(méi)有明顯的過(guò)去的動(dòng)作,不能用過(guò)去完成時(shí);敘述過(guò)去發(fā)生的事情,用一般過(guò)去時(shí)。故選D。
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