在窗体上画一个命令按钮(名称为Command1)，并编写如下代码： Function Fun1(ByVal a As Integer, b As Integer) As Integer Dim t As Integer t = a – b b = t + a Fun1 = t + b End Function Private Sub Command1_Click() Dim x As Integer x = 10 Print Fun1(Fun1(x, (Fun1(x, x – 1))), x – 1) End Sub 程序运行后，单击命令按钮，输出结果是(　　)。 11 21 0 10 A. B. C. D.

在窗体上画一个命令按钮(名称为Command1)，并编写如下代码： Function Fun1(ByVal a As Integer, b As Integer) As Integer Dim t As Integer t = a – b b = t + a Fun1 = t + b End Function Private Sub Command1_Click() Dim x As Integer x = 10 Print Fun1(Fun1(x, (Fun1(x, x – 1))), x – 1) End Sub 程序运行后，单击命令按钮，输出结果是(　　)。 11 21 0 10 A. B. C. D.

正确答案：C