◎ 题干
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
◎ 答案
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◎ 解析
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◎ 知识点
    根据n多题专家分析,试题“Our teacher is always busy preparing lessons until 11 o’clock at night, we students have gone to sleep.A.that timeB.by which timeC.by that timeD.which time…”主要考查了你对  【状语从句】【限制性定语从句】【主语从句】【同位语从句】  等知识点的理解和应用能力。关于这些知识点的“档案”,你可以点击相应的链接进行查看和学习。