单项选择题

执行下面的程序，单击窗体后在窗体上显示的结果是 ______。
Private Sub form_ Click()
Dim Str1 As String, Str2 As String
Dim Str3 As String, I As Integer
Str1 = "e"
for I = t To 2
Str2 = Ucase (Str1)
Str1 = Str2 & Str1
Str3 = Str3 & Str1
str1 = Chr (Asc(Str1) + I)
Next I
Print Str3
End Sub

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