一道英语题,选什么,理由!

问题描述:

一道英语题,选什么,理由!
i think we should do something to prevent it ()
A polluted B being polluted C polluting D to be pollute

B
这里省略了from,prevent sb.from doing sth.防止某人做某事
这里意思是防止它被污染,所以用being polluted.