◎ 题干
At home, he never seems to have time until after 10:30 pm, ________ his children have gone to bed.
[     ]
A.whose time  
B.when
C.on which  
D.by which time
◎ 答案
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◎ 解析
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◎ 知识点
    根据魔方格专家分析,试题“At home, he never seems to have time until after 10:30 pm, ________ his children have gone to bed.[ ]A.whose timeB.whenC.on whichD.by which time…”主要考查了你对  【关系代词】【介词和介词短语】【非限制性定语从句】  等知识点的理解和应用能力。关于这些知识点的“档案”,你可以点击相应的链接进行查看和学习。