2. 外语
  3. People will find themselves suffering from headache and watering eyes, and even snowhlindness, when______to several hours of "sn

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

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问题 People will find themselves suffering from headache and watering eyes, and even snowhlindness, 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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