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?
The lady must have waited for you for a long time,mustn't she?
mustn't->hasn't
为什么呢?
问题解答：
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