Ladies and gentlemen please remain until the plane has come to a complete stop.A. seated

问题补充：

Ladies and gentlemen, please remain until the plane has come to a complete stop.

A. seated

B. seating

C. to seat

D. seat

答案：

A. seated

B. seating

C. to seat

D. seat

解析：

remain seated “坐好，坐着不动”，seated 既是过去分词，又具有形容词的特征，在句中作表语。