【题目】I believe that she must have been at home last night, ________?
A. didn’t she B. wasn’t she C. mustn’t she D. needn’t she
在线课程【答案】B
【解析】考查反义疑问句。句意：我相信她昨晚一定是在家，不是吗? 如果主句谓语是think, believe, expect, suppose, imagine等引导的宾语从句，疑问部分与宾语从句相对应构成反意疑问句。宾语从句中must have been是对过去事实的推测，反问时按been的过去时反问，故选B。