问题
选择题
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
答案：D
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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：D