题目

有如下 VB 程序段： Private Sub Command1_Click() Dim i As Integer,s As string s = "" For i = 1 To 3 Step 2  s = str(f(i)) + s Next i Text1. Text = s End Sub Function f(n As Integer) As Integer If n = 1 Then  f = 2 Else  f = f(n - 1) + n End If End Function 则执行该程序段后，s 的值为（  ） A . 247 B . 27 C . 72 D . 742 答案：C

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