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At home ,he never seems to have time until after 10:30 pm,__

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At home ,he never seems to have time until after 10:30 pm,_____his children have gone to bed.
B、 when
D、 by which time
为什么选B不选D呢,B哪里错了?
正确答案为:
从句中时态为现在完成时
by which time可用用完成时
而when不能用于完成时
翻译为:
在家时,直接他孩子十点半以后上床睡觉了,他才有时间.