I never heard of it before.

我以前从来没听说过。

youdao

I've never heard of it. What was on show?

我从来没听说过它。展览中展出了什么？

youdao

Have you never heard of it?

你没听说过它吗？

youdao

People who have never heard of a macaron usually confuse it with the much better known treat spelled with two Os,the macaroon.

VOA: special.2010.04.12

How would it strike you if you knew nothing about it, if you had never heard of it before, if you open up the covers of this book for the first time?

如果你对新约一无所知，如果你对新约为所未闻，如果这是你，第一次翻开新约，会有什么感觉？

耶鲁公开课 - 新约课程节选

You cannot say, "I never heard of it. I don't know where it came from."

你就不能再说,"我从没听说过,我不知道它是怎么来的"

耶鲁公开课 - 基础物理课程节选

He'd never heard of it before, and had no idea how it would sound, but he took the challenge.

CNN: STORY HIGHLIGHTS

It is so obscure that three prominent synthetic biology researchers contacted by FORBES including Venter said they had never heard of it.

FORBES: End Of An Era: The Last Herper-Langreth Biotech Story

Those who last year had never heard of it will start handing out personal blog Web addresses alongside with their e-mail addresses.

FORBES: Google Goes Blog-Crazy