12.______ of the burden of ice,the balloon climbed up and dr

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12.______ of the burden of ice,the balloon climbed up and drifted to the South.
a.To be free b.Freeing c.To free d.Freed

D
句意是：去掉了冰的负重以后,气球爬升起来,向南飘去了.
看得出来主语是balloon,谓语是climb和drift,那么句首的free必然是伴随状语.伴随状语使用什么形式,由伴随状语里的动词和主语的关系决定.动宾关系使用过去分词（表示被动）,主语是动作发出者时使用现在分词. free someone(something) of (from)something表示使某人（物）不再受制于某物,someone是free的宾语,句子里的balloon充当了someone的成分,是free的宾语,所以应该使用过去分词.选D.

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