having said all that 是什么结构?

问题描述:

having said all that 是什么结构?
having said all that ,nobody knows .
这个句子中 having said all that 是什么结构?

前面应该有个代词做主语啊
有个人)已经交待了(or 陈述)全部的事,没人知道.这是翻译
having said 现在完成进行时 all 所有 that 指 said的那事儿