◎ 题干
I don't know what _______ last night.      
[     ]
A. did he happen  
B. he happened  
C. happened for him
D. happened to him
◎ 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“I don't know what _______ last night. [ ]A. did he happenB.he happenedC.happened for him D.happened to him…”主要考查了你对  【实义动词的过去式】【介词】  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。