题目

有如下 VB 程序段： Const n = 7 Dim a(1 To 7) As Integer Dim flag(1 To 7) As Integer       'flag 数组初始值均为 0 Dim k As Integer, t As Integer a(1) = 18: a(2) = 34: a(3) = 56: a(4) = 23: a(5) = 29: a(6) = 39: a(7) = 72 k = (1 + 7) / 2 For i = 1 To n     For j = 1 To n         If a(j) > a(k) And flag(j) = 0 Then t = a(j): a(j) = a(k): a(k) = t     Next j     flag(k) = 1     k = (k + 5) Mod 7 + 1 Next i 执行该段程序后，数组元素a(1)到a(7)的值为（    ） A . 29,23,18,72,56,39,34 B . 39,56,72,18,23,29,34 C . 34,39,56,72,18,23,29 D . 34,29,23,18,72,56,39 答案：C

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