______ of the burden of two bags, the balloon climbed up and drifted to the Nort

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问题 ______ of the burden of two bags, the balloon climbed up and drifted to the North.

选项 A、Freed
B、To be freed
C、Freeing
D、To free

答案 A

解析在本题中，过去分词短语作表示时间的状语，其语法功能相当于 After/When the balloon was freed of the burden of two bags．．．”由于free表示的是句子主语the balloon所承受的动作，表示的是被动关系，所以应用过去分词的形式。

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[originaltext]Balloonshavebeenusedforsportsforaboutonehundredyea