—Show me your permit, please.
—Oh, it's not in my pocket. It ________.
A．must have fallen outB．might fall out
C．could fall outD．should have fallen out
A
A 考察情態(tài)動詞。句義：請給我看你的準入證。哦！證件不在我的口袋里，肯定掉了。Must have done表示對過去事情的肯定推測。意為：一定做了某事。故A正確。
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