摘要： 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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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．
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A．When filled B．Filling
C．Having filled D．When filling
查看习题详情和答案>>________ 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