I don't think Ken did such a stupid thing ,____? A.do i B.di

I don't think Ken did such a stupid thing ,____? A.do i B.di I don' t think Ken did such a stupid thing,_____? I don't think ken did such a good thing,___?A do I B did I C I don't think he could do such a stupid thing last night,___ I don't think he did such a bad thing ______(反意疑问句),为什么答案是di 反义疑问句I don't think he could have done such a stupid thing la I don’t think he could have done such a stupid thing last ni I don't think he could have done such a stupid thing last ni I don,t think he could have done such a stupid thing last ni 10.I don't think he could have done such a stupid thing last I don't think such a good thing would i don't know why did she do such a thing这句话的语法对吗,为什么