_________ from other continents for millions of years, Australia has many special animals and plants．A.Being separatedB.Having separatedC.To be separatedD.Having been separated
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D解析本题考查分词短语作状语，其逻辑主语必须与主句的主语Australia一致，所以应该用被动结构，又由于Australia早已被分离，已经完成，动作发生在has动作之前。故D项正确。