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—Show me your permit, please.

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

Amust have fallen out Bmight fall out

Ccould fall out Dshould have fallen out

 

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。

 

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