Some very mon things such as to the sun for a long time will do harm to people's skin and even cause skin cancerA.exposingB.being exposedC.having exposedD.exposed
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B解析试题分析：考查动名词做主语，句意：一些非常普通的事情，如暴露在太阳下面很长时间，会对人的皮肤有害甚至造成皮肤癌。Will do是这句话的谓语，前面是主语，用动名词做主语，be exposed….，是“暴露于”，选B。
考点：考查动名词做主语