People will find themselves suffering from headache and watering eyes, and even snowblindness, when______to several hours of "sn

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问题 People will find themselves suffering from headache and watering eyes, and even snowblindness, when______to several hours of "snow light".

选项 A、being exposed
B、having been exposed
C、exposed
D、exposing

答案C

解析 相当于when they are exposed to…。在when,if,unless,though,while,once引导的从句中,如省略,必须将主语与be动词一起省掉。另外,“人们被置于雪光中”,是被动语态,所以D是错的。
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