It is often ————(snow)in the north of China in winter中填snowing 还是 snowy能不能讲一下为什么?如果没有often,snowing和snowy是不是都可以用?

问题描述:

It is often ————(snow)in the north of China in winter中填snowing 还是 snowy
能不能讲一下为什么?
如果没有often,snowing和snowy是不是都可以用?