They won't even admit there is any need for an investigation.他们甚至不愿承认有必要进行调查。

I do admit that she has been unfairly treated.我确实承认她受到了不公正对待。

I must/have to admit (that) …我必须承认…

He is clever, I must admit.他很聪明, 我得承认。

I have to admit that there's a lot of truth in what she says.我不得不承认, 她所说的很有道理。