Question

【题目】They didn’t go to bed ______ they finished their homework.

A.untilB.becauseC.whenD.while

Answer 1

【答案】A

【解析】

句意：他们直到做完作业才去睡觉。

考查连词。until直到；because因为；when当……时候；while当……时候。结合句意及didn't可知，此句应用固定表达not…until…，意为"直到……才……"，引导时间状语从句，故选A。