I don't think/I think的反义疑问句,以从句为准.但是当think前边的主语是二三人称时,以think前边的主语为准.couldn‘t have done（否定前移了）表示对过去的否定推测,表推测时,不以情态动词为准.若后边有表过去的时间词（如last night）,则用did提问,若没有表过去的时间词,以have提问.
所以第一题选 C；
第二题选 C.
不懂追问.
I don't think he could have done such a stupid thing last ni
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