英语:he wanted to know who the man that was being operated on was.为什么有两个was?帮我分析一下句子结构

整个这里是宾语从句：
who the man that was being operated on was
其中that was being operated on 是定语从句 was 是助动词,构成过去进行时的被动语态
宾语从句的主干部分是：
who（表语） the man（主语） was （系动词）
请在客户端右上角评价点“满意”即可,怎么翻译他想知道那个正在接受手术的人是谁