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
選B。句意為“我們的老師總是忙著備課到晚上11點(diǎn)鐘，那時(shí)我們已經(jīng)睡了”。by意為“到……時(shí)(為止)”，which time 指代“11 o’clock at night’。
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