题目内容
All the guests at the party were dancing and singing happily _____ the electricity was cut off.
A. until B. while C. when D. because
C
【解析】
试题分析:句意:当电源被切断后,聚会上的所有客人都高兴地又唱又跳。Until直到;while然而;when当……时候;because因为,选C。
考点:考查连词辨析
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