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    精英家教网 > 高中英语 > 题目详情
    Our teacher is always busy preparing lessons
    until 11 o’clock at night, ______we students have gone to sleep.
    A．that timeB．by which time
    C．by that timeD．which time
    B
    选B。句意为“我们的老师总是忙着备课到晚上11点钟，那时我们已经睡了”。by意为“到……时(为止)”，which time 指代“11 o’clock at night’。
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