What did your teacher talk about at the class meeting?（该为被动语态）

题目

What did your teacher talk about at the class meeting?（该为被动语态）
What _________ _________ about at the class meeting?
除了给出答案,请附加上说明,）
我的答案是填“were talked”,答案上写的是"was talked",

答案

因为人说的话（talk,say）一般来说都是用单数,比如What he said is a lie.他说的是谎话.
但有时例外,例如 Her words remind me so much.她的话让我联想起很多事情.（这句的主语words 就应该看成复数,所以表示一般现在时时remind 用原形）