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--- 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

题目详情
--- 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
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答案和解析
both指的是两者都,是复数
either指的是一个或另外一个,是单数