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    【题目】If ________ in the elevator, please press the emergency button immediately.

    A. trapped B. trapping

    C. having trapped D. to be trapped

    【答案】A

    【解析】

    试题分析：考查非谓语动词和省略句。后半句是一个祈使句，祈使句的主语you被省略了，且you和动词trap构成被动关系，所以在条件句中使用被动语态If you are trapped；当状语从句的主语和主句主语一致且含有be动词的时候，可以表示主语和be动词一起省略。故A正确。

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