问题
选择题
_____ 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
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。