题目内容
【题目】We were reading the newspaper _______ suddenly the light went out (熄灭).
A. when B. while C. as D. /
【答案】A
【解析】句意:我们正在看报纸,这时灯突然熄灭了。while当……时候; as当……时候;when引导的时间状语从句可表示动作突然发生,意为“这时”。句式:be doing when...,while 和as没有这种用法。故选when。
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