I did the best I could, I guess.

我想，我应尽我所能。

youdao

I did the best I could.

我已尽我所能。

youdao

Professor, I did the best I could on this test.

教授先生，我这次考试已经竭尽全力了。

youdao

I did the best I could. You did good.

VOA: standard.other

"They had a lot of questions, and I did the best job that I could in answering them, " said Texas lawyer Bill Burton.

CNN: Navigation

And then last night, I did my best to lay out the stakes in this election, which could not be higher.

WHITEHOUSE: The White House