to sunlight for too much time will do harm to one’s skin.
A. After exposed
B. If exposing
C. Having exposed
D. Being exposed
网友回答
A. After exposed
B. If exposing
C. Having exposed
(答案→)D. Being exposed
解析：考查非谓语动词。句中考查动名词短语作主语，be exposed to暴露在…..。句意：在阳光下暴露太长的时间将对一个人的皮肤有害。故D正确。