【题目】The pilot asked all the passengers on board to remain ____ as the plane was making a landing.
A. to be seatedB. seating
C. to be seatingD. seated
在线课程【答案】D
【解析】
考查非谓语动词。句意：飞行员让飞机上所有乘客在飞机降落时保持坐好。be seated 表示“坐着”，强调一种状态，这里的 remain 是系动词，remain seated 就相当于be seated，故用过去分词形式。故正确答案为D。