The pilot asked all the passengers on board to remain ________ a

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
【正确答案】：C
【题目解析】：seated 在这里是一个形容词的词形,remain后面跟形容词,是表示保持某种状态.飞机降落时,乘客应保持坐在座位上不懂,这是原句要表达的意思.