求指导Li Po wrote the famous poem when he made a tour to {what}was once a battlefield.
问题描述：
求指导Li Po wrote the famous poem when he made a tour to {what}was once a battlefield.
Li Po wrote the famous poem when he made a tour to {what}was once a battlefield.这里的宾语从句为什么用what引导,而不能用where呢?
答
what 是连接代词,where是连接副词,连接代词一定可以在句中充当语法成分（主 宾 定 表）而连接副词只能充当状语,看原句,缺少主语成分,所以只能用what, where不能充当主语成分