to sunlight for too much time will do harm to one’s skin.
A. Being exposed
B. Exposed
C. Having exposed
D. After being exposed
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(答案→)A. Being exposed
B. Exposed
C. Having exposed
D. After being exposed
解析：试题分析：考查动名词做主语。这里的施动者是阳光,被动者是皮肤,显然皮肤暴露在阳光下要使用被动形式,被动形式就要加be动词而做主语要将动词名词化,故be变为being,所以选c.expose是暴露的意思。句意：皮肤在阳光下暴露太久会受伤的。