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写出为什么选 32______,the students had to go to bed.

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写出为什么选 32______,the students had to go to bed.
A.The lights had gone out
B.The lights having gone out
C.The lights went out
D.The lights have gone out
选B
因为灯灭了对后面动作产生影响,所以用完成时态
又因为,前后主语不一致
所以用独立主格的结构 逻辑主语+分词
所以选B