【题目】Judging from what he said, he must have witnessed the incident last week, ______?
A.hasn't heB.didn't heC.mustn't heD.wasn't he
在线课程【答案】B
【解析】
考查反意疑问句。句意：从他所说的来看，他一定是目击了上周的那件事，是吗?根据前面的时间状语last week，must have done 表示对过去事实肯定的推测。可知，此处是对过去的反问，陈述部分是肯定，疑问部分用否定。故选B。