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：考查非谓语动词。句意：长时间日晒会对皮肤对不利。主语是being exposed to sunlight，谓语是will do harm to，宾语是skin，for too much time是定语。皮肤被晒伤，所以选择被动，所以是C或者D。但是D不能做主语，因为它前面是个介词，所以只能做状语。