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【題目】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】

試題分析：考查非謂語動詞和省略句。后半句是一個祈使句，祈使句的主語you被省略了，且you和動詞trap構成被動關系，所以在條件句中使用被動語態(tài)If you are trapped；當狀語從句的主語和主句主語一致且含有be動詞的時候，可以表示主語和be動詞一起省略。故A正確。

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