________ with a gas which is lighter than air, a balloon can float in the air.
A.When fillingB.When filledC.FillingD.Having filled在线课程B
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with a gas which is lighter than air, a balloon can float in the air.A.When fillingB.When filledC.Fi
编辑：chaxungu时间：2026-04-24 12:54:48分类：高中英语题库
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