对关键字序列{23,17,72,60,25,8,68,71,52} 进行堆排序，输出两个最小关键字后的剩 余堆为( )。

A. {23,72,60,25,68,71,52} B.{23,25,52,60,71,72,68} C. {71,25,23,52,60,72,68} D.{23,25,68,52,60,72,71}

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正确答案：D