PROC MERGESORT(low,high)if low＜high then mid=(low+high)/2 CALL MERGESORT(low,mid)CALL CALL MERGE(low,mid,high) MERGE是两个子序列的合并算法，归并排序算法,空白处选择（ ） \n \n \n \n \n \n \n

\n \n \n \n A.\n MERGESORT(mid,high)\n

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\n \n \n \n B.\n MERGESORT(low,mid+1,high)\n

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\n \n \n \n C.\n MERGESORT(mid,high-1)\n

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\n \n \n \n D.\n MERGESORT(mid+1,high)\n