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    When filled with a gas lighter than air,a balloon can in the air. A.fly B.float C.wander D.sail 【查看更多】

     

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    1.      When filled with a gas lighter than air,a balloon can_____in the air. A.fly　 B.float　 C.wander　 D.sail

     

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    ______ with a gas lighter than air, a balloon can float in the air．

    [　　]

    A．When filled 　　　B．Filling

    C．Having filled 　　D．When filling

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    ________ with a gas which is lighter than air, a balloon can float in the air.


    1. A.
      When filling
    2. B.
      When filled
    3. C.
      Filling
    4. D.
      Having filled

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    ________ with a gas which is lighter than air, a balloon can float in the air.

    [　　]

    A．When filling　　　　　　B．When filled

    C．Filling　　　　　　　　 D．Having filled

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    ________ with a gas which is lighter than air, a balloon can float in the air.

    [　　]

    A．When filling　　　　　　B．When filled

    C．Filling　　　　　　　　 D．Having filled

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