to sunlight for too much time will do harm to one’s skin.A. Being exposed B. Having expose

问题补充：

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

答案：

(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。