Some very common things such asto the sun for a long time will do harm to people's skin an

问题补充：

Some very common things such asto the sun for a long time will do harm to peoples skin and even cause skin cancer

A. exposing

B. being exposed

C. having exposed

D. exposed

答案：

A. exposing

(答案→)B. being exposed

C. having exposed

D. exposed

解析：考查动名词做主语，句意：一些非常普通的事情，如暴露在太阳下面很长时间，会对人的皮肤有害甚至造成皮肤癌。Will do是这句话的谓语，前面是主语，用动名词做主语，be exposed….，是“暴露于”，选B。