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We were having evening class ____ the light went out.
A.whileB.even ifC.as if D.when
D

试题分析:原句意思是,当灯熄灭的时候,我们正在上晚自习。While 然而,当……的时候(持续时间较长);even if 即使; as if好像;when 当……时候,(侧重强调一个时间点)。所以选D。
点评:有些单词和词组的意思相近,但侧重点不同,比如本题中的While和when都可以表示“当……的时候”,但前者侧重表达一段时期,后者侧重表达某个时间点。在平时的学习中要注意总结,做题时要注意区分。
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