They were reading ( ) the light was out .A.when B.while选A还是B?

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Theywerereading()thelightwasout.A.whenB.while选A还是B?Theywerereading()thelightwasout.A.whenB.while选A还是

They were reading ( ) the light was out .A.when B.while选A还是B?
They were reading ( ) the light was out .A.when B.while选A还是B?

They were reading ( ) the light was out .A.when B.while选A还是B?
选A
the light was out 灯熄了,是终止性动词,也叫瞬间动词.
①when意为"在……时刻或时期",它可兼指"时间点"与"时间段",所引导的从句的动词既可以是终止性动词,也可是持续性动词.如:
When I got home,he was having supper.我到家时,他正在吃饭.
When I was young,I liked dancing.我年轻时喜欢跳舞.
②while只指"时间段",不指"时间点",从句的动词只限于持续性动词.如:
While I slept,a thief broke in.在我睡觉时,盗贼闯了进来.

b
因为when多指一个时间点,而while多指一个时间段。the light was out 是一个时间段,如果是the light went out 则要用when因为那是一个时间点。

A,when 前面延续,后面短暂,果断用when

选择 B
when比较倾向于两个并列的。而while有对比的感觉。
比如 I was reading when my mon was cooking in the kitchen.
while链接的两个句子,一个是用进行时态,一个是用一般时态。
希望采纳。