摘要: to sunlight for too much time will do harm to one's skin. 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one's 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.答案为C.

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