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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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科目：高中英語 來源： 題型：014

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

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科目：高中英語 來源：浙江省金華一中2011－2012學年高二上學期期中考試英語試題（中加班）（人教版） 題型：050

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科目：高中英語 來源： 題型：單選題

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