excel宏定义问题，输出前三列到txt

Question

我想输出excel表中的前三列内容到txt中，中间用空格隔开。这里有宏定义只是输出前两列，怎么改成输出前三列的？麻烦各位大神帮忙看看了！谢谢！
Sub st()
Dim rg As Object
Dim Strtemp
Dim rc As Long
rc = Application.Max(Range("A" & Rows.Count).End(xlUp).Row, Range("B" & Rows.Count).End(xlUp).Row)

Strtemp = ""
For Each rg In Range("A1:B" & rc)
If rg.Row <= rc Then
If rg.Column = 1 Then
Strtemp = Strtemp & rg.Value & vbTab
Else
Strtemp = Strtemp & rg.Value & vbCrLf
End If

End If

Next
Open ThisWorkbook.Path & "\AB.txt" For Output As #1
Print #1, Strtemp
Close #1

End Sub

Answer 1

Sub st()
    Dim rg As Object
    Dim Strtemp
    Dim rc As Long
    rc = Application.Max(Range("A" & Rows.Count).End(xlUp).Row, Range("B" & Rows.Count).End(xlUp).Row, Range("C" & Rows.Count).End(xlUp).Row)

    Strtemp = ""
    For Each rg In Range("A1:C" & rc)
        If rg.Row <= rc Then
            If rg.Column <> rc Then
                Strtemp = Strtemp & rg.Value & vbTab
            Else
                Strtemp = Strtemp & rg.Value & vbCrLf
            End If
        End If
    Next
    Open ThisWorkbook.Path & "\AB.txt" For Output As #1
    Print #1, Strtemp
    Close #1

End Sub