For a moment I could say nothing. I could only stand and look.

一时间我什么也说不出来，只能站在那儿看着。

《柯林斯英汉双解大词典》

I could say nothing but that I'm sorry.

我什么也不好说，只能说对不起。

youdao

I could say nothing but that I was sorry.

我除了说“对不起”之外，什么也说不出来。

youdao

And nothing I could do or say could make the army move."

VOA: special.2009.11.05

But nothing I could say seemed to help the Red Sox.

NPR: Red Sox Game Locks in a Father's Day Memory

He glanced back as he was going, and I could see that he knew as well as I did that there was nothing more to say, but he said it anyway.

NEWYORKER: Something Like Happy