Parents are aware of the dangers of ____ violence on TV .
A.children exposed to B.children’s exposing to
C.exposing children to D.exposed children to
要详细的过程和思路，特别是辨析B和C，另外我想知道B和C是属于动词ING形式呢还是属于独立主格结构。谢谢

Parents are aware of the dangers of ____ violence on TV .
A.children exposed to B.children’s exposing to
C.exposing children to D.exposed children to

整体句意不复杂: 父母意识到.....的危险.
the danger of doing something 是固定的结构.

A. 变成 the danger of children 了, 错误.

B. 这里expose的主语是parents不是children, 所以不能用这个结构. 如果说Parents are aware of the dange of their exposing children to violance on TV 还说的过去, 虽然很累赘.

C. 这个是正确的, 因为expose的主语就是parents, 而且是主动的动作, 这样用说明了"某人去做某事的危险".
再看个例子:Do you realize the risk of doing that? 你了解(你)那样做的风险么?

D. of 后边不能用过去分词. 而且这里也没有被动的意思.


还有这里都不是独立主格的用法, 只是of doing. 独立主格是用分词结构代表一个完整句子.
比如:The test finished, we began our holiday.
　= When the test was finished, we began our holiday.
　　考试结束了，我们开始放假。
　　
　　The president assassinated, the whole country was in deep sorrow.
　= After the president was assassinated, the whole country was in deep sorrow.
　　总统被谋杀了，举国上下沉浸在悲哀之中。

　　Weather permitting, we are going to visit you tomorrow.　= if weather permits, we are going to....
　　如果天气允许，我们明天去看你。