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:

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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