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 snowhlindness, 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。