expose the skin to sunlight /the skin is exposed to sunlight

问题描述:

expose the skin to sunlight /the skin is exposed to sunlight
(being exposed )to sunlight too much will do harm to one's skin
为什么这个句子里做主语的动名词要用被动形式?exposing 不可以吗?

只要找到是主谓关系还是动宾关系就可以了.
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