______oftheburdenofice,theballoonclimbedupanddriftedtothesouth．A.Tob

发布时间：2020-08-06 19:51:23

______ of the burden of ice, the balloon climbed up and drifted to the south．A.To be freeB.FreeingC.To freeD.Freed

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D解析由After the balloon was freed of the burden of ice转换而成。
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