一般过去时否定句 — 英语词汇题
题目
根据句意，用 wasn't 或 weren't 填空（每空一词）。Sam 正在介绍他家人的过去：My grandma worked at a school before, so she ______ a doctor. My parents were farmers before, they ______ drivers. My grandpa was a policeman, he ______ a teacher before.