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At home, he never seems to have time until after 10?30 pm, his children have gon

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At home, he never seems to have time until after 10?30 pm, his children have gon

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

试题答案

D