Our teacher is always busy preparing lessons

until 11 o’clock at night, ______we students have gone to sleep.

A. that time       B. by which time

C. by that time     D. which time

B


解析:

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

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