英语翻译
问题描述：
英语翻译
A：Morning,Jack!Late again?What's the excuse this time?
B;I'm awfully sorry.I must have turned the alarm off and gone back to sleepp again.
Q:what do we learn from the conversation?
答
A：早上好,杰克!又迟到了?这次是什么理由?
B：非常抱歉.我肯定是把闹钟关了又接着睡着了.
问题：从对话中我们能知道什么?
must have done sth 对过去表示推测.
例如：
The ground is wet. It must have rained last night.
地面是湿的,昨天夜里一定下雨了.