The question is that we should make it____how serious the population problem is.

问题描述:

The question is that we should make it____how serious the population problem is.
横线上填什么?known to ecerybody,
可我不理解,觉得这个known by everybody更对啊

known to everybody让大家都知道.
by后面应该动作的执行者,而这个句子的动作执行者是we,所以不能用by