题目内容：

关于英语被动用法的题目
5.__________ 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
为什么是C不是A呢?不是应该是被动吗?C的话不是应该是同时进行吗?

优质解答

应该选C
（ __________ to sunlight for too much time ）will do harm to one's skin.括号内是句子的主语,而选项中只有动名词能做主语.所以这是动名词的被动语态 being done.用A选项是构成过去分词短语,不可以作主语.