Last night I was watching some news about the American financial crises(金融危机) on TV the power went off.
A. while
B. as
C. when
D. during
网友回答
A. while
B. as
(答案→)C. when
D. during
解析：句意：昨天晚上我正看着电视上播出美国金融危机的事情这时突然停电了。空格前后是句子，所以这里缺少连词，故排除D；表示正在做某事突然发生另一件事，只有when有这种用法。