◎ 题干
–When did he come back last night?
--It was at 8 o’clock ________ I was watching a documentary on TV.
A.sinceB.thatC.whenD.which
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◎ 解析
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◎ 知识点
    根据n多题专家分析,试题“ –When did he come back last night? --It was at 8 o’clock ________ I was watching a documentary on TV.A.sinceB.thatC.whenD.which…”主要考查了你对  【限制性定语从句】【非限制性定语从句】  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。