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 親愛的乘客，為了保證你的安全，在飛機完全停下來之前請坐在座位上．

解答 答案：A 句中seat作系動詞remain的表語；seat sb安排某人坐下，后面要接人作賓語，題干中seat后沒有賓語，說明祈使句的主語you作seat的賓語，要用表示被動的過去分詞形式．故選A．

點評 過去分詞是非謂語動詞的一種，用法很靈活，分為簡單式done（表示與謂語同時或幾乎同時發(fā)生的動作）；完成式having been done（表示先于謂語的動作）．學(xué)習(xí)時，要把握其用法特征：表示被動和完成．同時還要注意區(qū)分現(xiàn)在分詞和不定式．

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