题目

有如下VB程序： n = 4 For i = 1 To 25     j = 1: a(j) = a(j) + 1     Do While a(j) = 4         a(j) = 0         j = j + 1         a(j) = a(j) + 1     Loop Next i For i = 1 To n     s = Str(a((i + 1) Mod 4 + 1)) + s Next i 数组a(1)至a(4)初值均是0，执行该程序后，s的值是（     ） A . "1012" B . "2101" C . "0121" D . "1210" 答案：B

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