I was sad that I couldn’t keep it, and that it didn’t live while I kept it. 请问这句话是表语从句吗?这里的that 也是关系代词吗? 如果不是表语从句,这里that 引导的是什么从句? 如果是表语从句,可以简单介绍一下吗? 谢谢!