--- Have you seen Tom and Mary?--- I haven't seen ___ of them.为什么只能填both,不能填either.both和either的区别

分类: 作业答案 • 2021-12-20 03:09:26

问题描述：

--- Have you seen Tom and Mary?--- I haven't seen ___ of them.为什么只能填both,不能填either.
both和either的区别

答