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    7、The poliot 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

    7、C

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    The poliot 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

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