to sunlight for too much time will do harm to ones skin.A. ExposedB. Having exposedC. Be

问题补充：

to sunlight for too much time will do harm to ones skin.

A. Exposed

B. Having exposed

C. Being exposed

D. After being exposed

答案：

A. Exposed

B. Having exposed

C. Being exposed

D. After being exposed

解析：

在非谓语动词中，用动名词或不定式来作主语，而分词和介词短语不能作主语，因此A、D被排除。在这个句子中，will do是谓语，缺少主语，要用动名词作主语。expose与ones skin是动宾关系，所以要用动名词的被动式being exposed。译文：在阳光下晒太长时间对人的皮肤有坏处。