Man is now facing a big problem ______ which is becoming如果是说污染是不是横线上加pollution?

分类: 作业答案 • 2022-02-17 16:11:57

问题描述：

Man is now facing a big problem ______ which is becoming
如果是说污染是不是横线上加pollution?

答

a problem of sth.
of pollution