It was said that something (do)to prevent the water from being polluted 这里是to do 还是to done

题目

It was said that something (do)to prevent the water from being polluted 这里是to do 还是to done

答案

something to be done 才对吧,没有something to done 的用法,这里不是主动语态不能用to do,用 to be done.