请看一道改错题 The lady must have waited for you for a long time,mustn't she?
问题描述：
请看一道改错题 The lady must have waited for you for a long time,mustn't she?
The lady must have waited for you for a long time,mustn't she?
mustn't->hasn't
为什么呢?
答
当could have
should have
must have 出现时,反义疑问句的助动词用have或者has