People will find themselves suffering from

问题单项选择题

People will find themselves suffering from headache and watering eyes, and even snowblindness, when () to several hours of "snow light".

A. being exposed

B. having been exposed

C. exposed

D. exposing

答案

参考答案：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。