题目内容

15．Dear passengers，to ensure your safety，please remainuntil the plane has come to a complete stop．（　　）
A．seatedB．seatC．to seatD．seating

分析 亲爱的乘客，为了保证你的安全，在飞机完全停下来之前请坐在座位上．

解答 答案：A 句中seat作系动词remain的表语；seat sb安排某人坐下，后面要接人作宾语，题干中seat后没有宾语，说明祈使句的主语you作seat的宾语，要用表示被动的过去分词形式．故选A．

点评 过去分词是非谓语动词的一种，用法很灵活，分为简单式done（表示与谓语同时或几乎同时发生的动作）；完成式having been done（表示先于谓语的动作）．学习时，要把握其用法特征：表示被动和完成．同时还要注意区分现在分词和不定式．

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