I have never met Carl before ,nor have I heard of him

I have never met Carl before ,nor have I heard of him I have never heard of him,_____ ? 一道单选题I have never heard _______ him before.A.of B.about C.in I've never heard of him before. I have never heard of it ____ before. Never before have I heard of such things的翻译 i have never heard of that place before I have never met him before.为什么用met而不是meet I have never heard() interesting news before Have you met him?Yes,I have just met him.I had never met him I have never met him before中的have是什么意思,为什么没有变过去失态 I have never heard of that before可不可以说成I had never hear of t