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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