Is this book __ yo bought yesterday 为什么要用the one?而不用which和that?
问题描述：
Is this book __ yo bought yesterday 为什么要用the one?而不用which和that?
答
用肯定句来看,This book is __ you bought yestday.
the one作先行词,省略了定语从句的which或that.如果直接填which或that,就没有先行词了