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__________,the students had to go to bed.A the lights having

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__________,the students had to go to bed.A the lights having gone out B the lights went out
__________,the students had to go to bed.A the lights having
the lights having gone out 这是个独立主格结构 也叫垂悬分词
这里需要一个短语,因为后面the students had to go to bed. 已经是一个完整的句子
如果选B的话 需加上连词,可以这么改
the lights went out,so that the students had to go to bed.
这才成立