单选题 Tom must have practiced swimming with his father last Sunday, ______ he?

【正确答案】 A
【答案解析】must表推测时，反义疑问句在形式上应与must后面的动词保持一致。因此本句的反义疑问句可以有两种形式hasn't．．或didn't...。因陈述句部分的时间状语为过去时间点，所以其反问部分应用didn't he。