[-C33] ____to sunlight for too much time will do harm to one’s skin.A.ExposedB.Having exposedC.Being exposedD.After exposed为什么选C不选A?

[-C33] ____to sunlight for too much time will do harm to one’s skin.A.ExposedB.Having exposedC.Being exposedD.After exposed为什么选C不选A?
[-C33] ____to sunlight for too much time will do harm to one’s skin.
A.Exposed
B.Having exposed
C.Being exposed
D.After exposed
为什么选C不选A?

[-C33] ____to sunlight for too much time will do harm to one’s skin.A.ExposedB.Having exposedC.Being exposedD.After exposed为什么选C不选A?
C.Being exposed 是对的.
这个句子缺少主语,而A.Exposed 是过去分词,是不能做主语的.只有C.Being exposed 动名词（的被动语态）,才可以做主语.