It's a terrible thing,living with the knowledge (that) the doctor are not able to save his life.
问题描述：
It's a terrible thing,living with the knowledge (that) the doctor are not able to save his life.
在此句中,括号里的 that 为什么不能换成 which ,要分析一下用了什么语法!
答
that引导的同位语从句,不用which引导.the knowledge 就是 the doctor are not able to save his life.