单选题 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
【答案解析】[解析] 考查过去分词作表语。remain是系动词，seated作表语，表示状态。