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4.Ladies and gentlemen,please remain __________ until the pl

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4.Ladies and gentlemen,please remain __________ until the plane has come to a complete stop.
A.seated B.seating C.to seat D.seat
为什么选A
1.Having a trip abroad is certainly good for the old couple,but it remains_______whether they will enjoy it.
A.to see B.to be seen
C.seeing D.seen
为什么选B.不选D
seat 是及物动词,remain 相当于联系动词,be seated = be sitting