_____ 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

C


解析:

 動名詞短語做主語，用系表結構表示狀態(tài)。

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Passage Eleven (Superconducting Materials)

The stone age, The Iron Age. Entire epochs have been named for materials. So what to call the decades ahead? The choice will be tough. Welcome to the age of superstuff. Material science -- once the least sexy technology – is bursting with new, practical discoveries led by superconducting ceramics that may revolutionize electronics. But superconductors are just part of the picture: from house and cars to cook pots and artificial teeth, the world will someday be made of different stuff. Exotic plastics, glass and ceramics will shape the future just as surely as have genetic engineering and computer science.

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科目：高中英語 來源： 題型：

_____ 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

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