问题
选择题
--When did your father come back last night?
--He didn't come back _______ he finished all the work.
A. until B. while C. if
答案
答案：A
题目分析：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。
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