【题目】I don’t think he could have done such a thing last night_____?
A. do I B. has he
C. could he D. did he
在线课程【答案】D
【解析】考查反义疑问句；反义疑问句遵循“前肯后否”，“前否后肯”的规则，前面用了否定前置“I don’t think he could have done such a thing”，所以后面用肯定语气；又因为这里是对过去的事情的提问，有一个具体的时间“last night”，所以助动词用did,故选D.