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    精英家教网 > 高中英语 > 题目详情
    “Show me your permit, please.” “Oh, it’s not in my pocket. It ______.”
    A．might fall outB．could fall out
    C．should have fallen outD．must have fallen out
    D
    既然“通行证现在不在口袋里”，那么它“掉出去”应发生在过去，故排除A和B。比较选项C和D所表示的意思，选D更恰当。
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