◎ 题干
We arrived home at 9:00 in the evening, ________most people had already had supper.
[     ]
A. at that time  
B. by that time
C. at which time  
D. by which time
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◎ 解析
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◎ 知识点
    根据n多题专家分析,试题“We arrived home at 9:00 in the evening, ________most people had already had supper.[ ]A. at that timeB. by that timeC. at which timeD. by which time…”主要考查了你对  【关系代词】【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。