问题补充:
to sunlight for too much time will do harm to your skin.
A. Exposed
B. Having exposed
C. Being exposed
D. After being exposed
答案:
A. Exposed
B. Having exposed
(答案→)C. Being exposed
D. After being exposed
解析:句意:在阳光下晒太长时间对人的皮肤有坏处。在这个句子中,will do是谓语,缺少主语,要用动名词作主语。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、B被排除。expose与ones skin是动宾关系,所以要用动名词的被动式being exposed。所以选C。