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

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A. while
B. even if
C. as if
(答案→)D. when
解析：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。