单项选择题

在窗体上画一个命令按钮(名称为Command1)，并编写下列代码：
Function Funl(ByVal a As Integer，b As Integer)As Integer
Dim t As Integer
t=a-b
b=t+a
Funl=t+b
End Function Private Sub Command1_Click()
Dim X As Integer
x=10
Print Funl(Funl(X,(Funl(x,x-1))),x-1)
End Sub
程序运行后．单击命令按钮，输出结果是( )