The pilot asked all the passengers on board to remain ________ as the plane was making a landing.

A. seat
B. seating
C. seated
D. to be seating

答案C
be seated表示“坐着”,强调一种状态,这句句子的意思是“飞行员要求机上所有的乘客在飞机着陆以前不要离开座位。”这里的remain其实作系动词来用,remain seated就相当于be seated,所以我们选C项。
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