【题目】﹣﹣﹣I spent a week in Xiamen last month．
﹣﹣﹣Then you must have been overcharged for sea food many a time， ________ you？This city is known for that．
A. mustn'tB. weren't
C. haven'tD. hadn't
在线课程【答案】B
【解析】
考查反义疑问句。句意：——上个月我在厦门呆了一周。——那你一定吃了不少海鲜，对么？那座城市以海鲜闻名。last month表示过去的时间，must have been表示对过去的推断，故B项正确。