I don,t think he could have done such a stupid thing last ni

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I don,t think he could have done such a stupid thing last night______?
did he ,
could have done表示对过去情况的推测,且有明显的时间状语 last night,故用过去时.
这样理解对吗,
还有能用 could he 么,

在这个句子中,既有现在时,也有虚拟语气：could have done
如果是过去时,就应该是did such a stupid thing last night.所以这里有一个说话者不相信他做了这件蠢事的意思.
在反意疑问部分用did,说话者是想问：他做了吗?
因此,这里就只能用did了.

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