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）

i don't think he was i don't think so回答i don't think he was能用i don't think so instead吗 I don‘t think he is tall,_____?He doesn't think he is tall,_____? I don't ()with peter.I think he is wrong. I don't think he is right.为什么不能是 I think he isn't right. I don't think he is .能否说成I think he isn't . I don't think I don't think 是I don't think he looks like还是I don't think he look like?.是I don't think he looks like还是I don't think he look like?是He don't think I looks like还是He doesn't think I look like?请同时将有关于don't think的语法点说一下, 1.Cou you tell me__ at the meeting? Sorry,I don't know.I didn't go to the meeting that day.1.Cou you tell me__ at the meeting? Sorry,I don't know.I didn't go to the meeting that day. A.what he says B.what he said C.what did he sayc你看后面是过 i don't think he is a good student,_ I don't think he （是 know还是knows) I don't think he speak Japanese well对吗 he,will,I,don't,think,come(连词成句) I don’t think he’s so great中的 so he said,i don't think so.改间接引语 i don't think he will go there,_____ ____? I don't think he can （ ）at school. 关于否定前移 I don't think he like apples还是做成I don't think he likes apples