—Show me your permit, please.

—Oh, it's not in my pocket. It ________.

A．must have fallen out B．might fall out

C．could fall out D．should have fallen out

 

A

【解析】A 考察情態(tài)動(dòng)詞。句義：請(qǐng)給我看你的準(zhǔn)入證。哦！證件不在我的口袋里，肯定掉了。Must have done表示對(duì)過(guò)去事情的肯定推測(cè)。意為：一定做了某事。故A正確。

 

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