单项选择题

在窗体中添加一个名称为Command1的命令按钮，然后编写如下代码：
Function F(a As Integer)
b=0
Static c
b=b+1
c=c+1
F=a+b+c
End Function
Private Sub Command1 Click()
Dim a As Integer
Dim b As Integer
a=2
For i=1 To 3
b=F(

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