There are some umberllas behind the door.对some umberllas behind the door.进行提问

分类: 作业答案 • 2021-12-03 11:58:57

问题描述：

There are some umberllas behind the door.对some umberllas behind the door.进行提问
__ __ behind the door?划线的部分填2个词.

答

what is behind the door为什么不用WHAT ARE默认单数，你问问题之前，怎么知道是单数还是复数，全部默认单数