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英语单选题The pilot asked all the passengers on board to remain _

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英语单选题
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
答案为什么选C?
emain adj.
remain doing sth
seated是动词的过去分词做形容词,remain seated
也可以是remain sitting
remain的语法一般有下面几种
1、sb./sth.remain+ n./adj.意思是“...依然...”
2、sth.remain to be done意思是“...有待被做”
3、sb.remain doing sth.意思是“...依然在做...”