Question

It took me too long to come up with the correct response."Do

Answer 1

to give somebody credit for 是个短语,本意是为某人提供信用贷款,这里用的他的延伸含义,意思是：相信某人有（某种优点）

根据这里的上下文,

"He knows more than I gave him credit for." 可以翻译为：

我相信他知道得确实很多.