单选题 (Not until) my mother told me (the sad news) last night (did I knew) that our neighbor Dr. Li (was killed) in a car accident the week before.
【正确答案】 C
【答案解析】Not until引导的状语从句置于句首时，句子部分倒装。本题中助动词did提到主语之前后谓语动词要用原形know。