◎ 题干
Do you know _____ this time yesterday?     

[     ]

A. who are they waiting    
B. who they are waiting for     
C. who were they waiting     
D. who they were waiting for
◎ 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“Do you know _____ this time yesterday? [ ]A. who are they waiting B. who they are waiting for C. who were they waiting D. who they were waiting for …”主要考查了你对  【过去进行时】【宾语从句】  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。