◎ 题干
The accident happened at nine o'clock in the morning ____ we were all busy with our work.
[     ]
A. that
B. which
C. when
D. as
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◎ 解析
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◎ 知识点
    根据魔方格专家分析,试题“The accident happened at nine o'clock in the morning ____ we were all busy with our work. [ ]A. thatB. which C. when D. as …”主要考查了你对  【关系副词】【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。