He thought I had known the fact.But a____-,I knew nothing about it.

He thought I had known the fact.But a____-,I knew nothing about it.
He thought I had known the fact.But a____-,I knew nothing about it.

He thought I had known the fact.But a____-,I knew nothing about it.
这个单词应是actually,译为但是实际上,我什么也不知道