I wish I'd known about that rule earlier",she said.这句话的 i‘d 是什么的缩写

I wish I'd known about that rule earlier",she said.这句话的 i‘d 是什么的缩写
I wish I'd known about that rule earlier",she said.
这句话的 i‘d 是什么的缩写

I wish I'd known about that rule earlier",she said.这句话的 i‘d 是什么的缩写
I had known,如果是would或者could的话,know不应该是known这个形式~

I'd——I would

I had