填when.
when引导的句子中的谓语动词一般是短暂性的瞬间动词,如see,hear等,went out是熄灭的意思,也是瞬间动词.
while引导的句子中的谓语动词一般是持续性的,动作能持续一段时间,如read,wait等.
We were watching TV ___ suddenly the light went out.
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