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

試題分析：考查引導(dǎo)詞，unless意思“除非”，until意思“直到…才…”，when意思“當(dāng)…時候”，后面跟短暫性動詞或延續(xù)性動詞；while意思“當(dāng)…時候”，后只跟延續(xù)性動詞，句子意思“當(dāng)事故發(fā)生的時候我們吃完圣誕團圓飯正出來”
點評：引導(dǎo)詞是�？純�(nèi)容，要知道它們的意思，它們的區(qū)別，遇到此類題時，就很容易做出選擇
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