Private Sub Text1_Change()
Dim a, i As Integer
a= Val(Text1.Text)
For i = 2 To 6 Step 2
If a<= 15 Then a = a + i
Next i
Text1.Text = Str(a)
End Sub
若在文本框Text1中输入2,执行该程序段,For语句的循环次数为( )
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