to sunlight for too much time will do harm to one’s skin.
A. Being exposed
B. Having exposed
C. Exposed
D. After being exposed
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(答案→)A. Being exposed
B. Having exposed
C. Exposed
D. After being exposed
解析：考查动名词做主语用法。本句中的动名词短语being exposed to sunlight for too much time在句中做主语，表示经常性习惯性的行为。句意：长时间暴露在阳光下将会对我们的皮肤有害。B项缺少被动的含义，CD项不能在句中做主语。故A正确。