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    helicopter can take off and land straight up or down, and can also stay still in air. A. The; an B. A; the C. A; 不填 D. The; 不填 【查看更多】

     

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              helicopter can take off and land straight up or down, and can also stay

    still in      air.

    A．The; an

    B．A; the

    C．A; 不填

    D．The; 不填

     

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              helicopter can take off and land straight up or down, and can also stay

      still in       air.

           A. The; an         B. A; the           C. A; 不填         D. The; 不填

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              helicopter can take off and land straight up or down, and can also stay
    still in      air.

    A．The; anB．A; theC．A; 不填D．The; 不填

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