问题补充:
to sunlight for too much time, as the doctors say, will do harm to one’s skin.
A. Being exposed
B. Having exposed
C. Exposed
D. After being exposed
答案:
(答案→)A. Being exposed
B. Having exposed
C. Exposed
D. After being exposed
解析:从题干可知,句子的谓语“will do”没有主语,而选项A、B和D均不能在句中作主语,它们可以在句中作状语,故均可排除。而选项C为动名词的被动式,符合语境。