题目内容

We were going out for a Christmas meal together ____ the accident happened.
A．unlessB．untilC．whileD．when
D

试题分析：考查引导词，unless意思“除非”，until意思“直到…才…”，when意思“当…时候”，后面跟短暂性动词或延续性动词；while意思“当…时候”，后只跟延续性动词，句子意思“当事故发生的时候我们吃完圣诞团圆饭正出来”
点评：引导词是常考内容，要知道它们的意思，它们的区别，遇到此类题时，就很容易做出选择
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