【題目】We were reading the newspaper _______ suddenly the light went out (熄滅).

A. when B. while C. as D. /

【答案】A

【解析】句意：我們正在看報紙，這時燈突然熄滅了。while當……時候； as當……時候；when引導(dǎo)的時間狀語從句可表示動作突然發(fā)生，意為“這時”。句式：be doing when...,while 和as沒有這種用法。故選when。

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