Please remain ___ until the plane has come to a complete stop .A.to seat B.to be seatedC.seatingD.seated答案选什么,原因?

Please remain seated 翻译? please remain ___ until the plane has come to a complete stop(seat ). Please remain ___ until the plane has come to a complete stop .A.to seat B.to be seatedC.seatingD.seated答案选什么,原因? remain remain Please sit down.___ ___ ___ ___ . 请问Please remain quiet.中的remain能换为keep吗?两者有什么区别, please guess who ___. UN Please remain--------?为什么答案是seated而不是seating?remain seating不是也有保持坐着的状态的意思 Please remain ____;the winner of the prize will be announced soon.A seating B seated remain doing不行么? 请尽快给我写信.（Please ___ ___ ___ soon.Please ___ ___ ___ ___ ___ soon.） 英语翻译please speake ___ __ ___ Please ___ Mr.king ___ 055-6557855 请尽快回信.(Please ___ back ___.) Wait a moment,please=___,___ a moment,please. 关于词性及结构please remain seatedplease remain silent这里的remain 是做动词还是做名词seated 和 silent 都是形容词,如果remain 是做不及物动词,形容词可以直接跟在不及物动词后面吗? Please ___(open)the door