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问题: ▃ ▄ ▅ 高中英语1题

_________to sunlight for too much time will do harm to one`s skin
A Exposed B Being exposed
为什么? 麻烦解释下不能选A的原因!谢谢

解答:

B
Being exposed to sunlight for too much time
是主语,动名词做主语。
所以选B