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问到英语语法问题.9.Jack admitted that he ought not to have taken awa

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问到英语语法问题.
9.Jack admitted that he ought not to have taken away the book,_____
(选D,为什么不是选C)
A.oughtn't he B.ought he C.did he D.didn't he
问到英语语法问题.9.Jack admitted that he ought not to have taken awa
该题考点是反义疑问句.反义疑问句由陈述部分和疑问部分组成.
题目中已经给出了陈述部分,首先分析一下该句子结构,主语是Jack,谓语是肯定形式的admitted,后面that引导了一个宾语从句.
后面的疑问句是对陈述句中的谓语做出反义的提问,因为陈述句是肯定形式的admitted,所以我们要用否定形式的疑问句.admitted是一个过去时,所以疑问句用did,否定形式就是didn't,完整的句子就是didn't he?