◎ 题干
— Show me your permit, please.
— Oh, it's not in my pocket. It ________.
[     ]
A. might fall out  
B. could fall out
C. should have fallen out  
D. must have fallen out
◎ 答案
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◎ 解析
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◎ 知识点
    根据n多题专家分析,试题“— Show me your permit, please.— Oh, it's not in my pocket. It ________.[ ]A. might fall outB. could fall outC. should have fallen outD. must have fallen …”主要考查了你对  【情态动词】【现在完成时】  等知识点的理解和应用能力。关于这些知识点的“档案”,你可以点击相应的链接进行查看和学习。