31. (单选题) The pilot asked all the passengers on board to remain _____ as the plane was making a landing.(本题1.0分) A、 seat B、 seating C、 seated D、 to be seating

31. (单选题) The pilot asked all the passengers on board to remain _____ as the plane was making a landing.(本题1.0分)
A、 seat
B、 seating
C、 seated
D、 to be seating

出自：陇东学院-大学英语2(专升本)

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