Question

--When did your father come back last night?
--He didn't come back _______ he finished all the work.        
A. until                 B. while                  C. if

Answer 1

A

试题分析：句意：你的父亲昨天晚上什么时间回来的？直到他完成了所有的工作他才回来。not…until…，直到···才···，故选A。