◎ 题干
You look unhappy. What ________ just now?    
[     ]
A. did you happen  
B. did happen to you  
C. happened to you
D. you happened
◎ 答案
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◎ 解析
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◎ 知识点
    根据魔方格专家分析,试题“You look unhappy. What ________ just now?[ ]A. did you happenB. did happen to youC. happened to you D. you happened…”主要考查了你对  【动词短语】【一般过去时】  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。