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