to sunlight for too much time will do harm to one’s skin.
A. Exposing
B. Being exposed
C. Having exposed
D. Exposed
网友回答
A. Exposing
(答案→)B. Being exposed
C. Having exposed
D. Exposed
解析：考察动名词做主语。本题是考察动名词做主语，且使用被动语态，故使用动名词的被动形式。句意：暴露在阳光下太长时间会对皮肤有很大伤害。故B正确。