. Please remain until the plane has come to a complete stop.A. to seatB. to be seatedC. s

问题补充：

. Please remain until the plane has come to a complete stop.

A. to seat

B. to be seated

C. seating

D. seated

答案：

A. to seat

B. to be seated

C. seating

(答案→)D. seated

解析：

D。由于seat用作动词时总是及物的，所以它的后面必须要用宾语，或用被动语态或过去分词，据此可排除A和C。由于不定式to be seated表示将来意义，所以也不能选择。