At home ,he never seems to have time until after 10:30 p.m.,_____his children have gone to bed.A whose time B when C on which D by which time选什么,为什么?

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Athome,heneverseemstohavetimeuntilafter10:30p.m.,_____hischildrenhavegonetobed.AwhosetimeBwhenConwhi

At home ,he never seems to have time until after 10:30 p.m.,_____his children have gone to bed.A whose time B when C on which D by which time选什么,为什么?
At home ,he never seems to have time until after 10:30 p.m.,_____his children have gone to bed.
A whose time B when C on which D by which time
选什么,为什么?

At home ,he never seems to have time until after 10:30 p.m.,_____his children have gone to bed.A whose time B when C on which D by which time选什么,为什么?
D(错了表怪偶,好多年不做了)
因为是逗号隔开,而前面一句很显然是一个完整的句子,所以后面会跟一个从句.A很显然不对,连意思都不通;B的话就不要逗号了;C which后面少了time,而且介词貌似也有问题.
所以选D.