题目

I don’t think he could have done such a stupid thing last night, _____?     A. do I             B. could he           C. did he                   D. has he     答案： C 陈述部分为主从句的复合句，且主句的主语和谓语是I think, I suppose, I believe, I imagine等结构时，附加疑问句的人称和数往往要与从句的人称和数保持一致，并要注意否定的转移。

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