She swore (that) she'd never seen him before.

她明确表示自己以前从未见过他。

《牛津词典》

We had never seen anything remotely like it before.

我们以前从未见过同它有丝毫相似的东西。

《柯林斯英汉双解大词典》

She averred that she had never seen the man before.

她斩钉截铁地说以前从未见过这个男人。

《牛津词典》

You never seen a frog so honest and simple as he was, for all he was so skilled.

VOA: special.2009.08.29

I've read through the same thing twenty times and I've missed something obvious. Someone who's never seen it before looks at and says, did you really mean to do this?

但是它们有一双旁观者之眼,我把同一段代码读上20遍,都会漏掉一些很明显的错误，从没看过这段代码的人会告诉我？

麻省理工公开课 - 计算机科学及编程导论课程节选

What this basically means is, you're given some problem to solve, that you've never seen before.

我们还会再讲讲这些内容,最基本的意思就是你有一个问题要处理。

麻省理工公开课 - 计算机科学及编程导论课程节选

"I have never seen it happen that a boss can work through a second-in-command, " says Xavier.

FORBES: Magazine Article

To support this very dinamic environment, teaching people to think, tackle even problems never seen before.

FORBES: Hunting Multicultural Talents for big revolution in business

Aides to the subcommittee said they have never seen a company employ such a complex structure.

WSJ: Apple Pays No Tax on Much of Its Overseas Income, Senate Panel Finds