I don't think he could have done such a stupid thing last ni

来源：学生作业帮编辑：神马作文网作业帮分类：英语作业时间：2024/09/21 04:34:35

I don't think he could have done such a stupid thing last night,__ A.could he B had he Cdid he
这里could不是情态动词,have不是助动词吗?为什么要用did?（答案选C）

不太好解释.
could have done 作为一个整体表示对过去发生的事的态度,只表示一种语气（我不相信他昨天晚上*竟然*做了这么件啥事）.而反义疑问的时候,要反问的是这个动作本身（做了这么件傻事）,而非这个语气（竟然）,所以直接问did he就可以了.

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