Our teacher is always busy preparing lessons

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
lipei1116 1年前 已收到1个回答 举报

kelly200401 花朵

共回答了20个问题采纳率:90% 举报

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’。

1年前

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