Question

—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

 

Answer 1

A

【解析】A 考察情态动词。句义：请给我看你的准入证。哦！证件不在我的口袋里，肯定掉了。Must have done表示对过去事情的肯定推测。意为：一定做了某事。故A正确。