Excel如何用VBA代码一键合并汇总多个工作簿中的指定Sheet?

如何修改如下代码，可以精准指定合并Sheet。
例如需要合并三张表如下，每张表里面有Sheet1, Sheet2,Sheet3。想要合并三张表里面，所有Sheet2的内容，生成一个汇总的Sheet。
表1.xlsx
表2.xlsx
表3.xlsx

Sub 合并目录所有工作簿全部工作表()
Dim MP, MN, AW, Wbn, wn
Dim Wb As Workbook
Dim i, a, b, d, c, e
Application.ScreenUpdating = False
MP = ActiveWorkbook.Path
MN = Dir(MP & "\" & "*.xls")
AW = ActiveWorkbook.Name
Num = 0
e = 1
Do While MN <> ""
If MN <> AW Then
Set Wb = Workbooks.Open(MP & "\" & MN)
a = a + 1
With Workbooks(1).ActiveSheet
For i = 1 To Sheets.Count
If Sheets(i).Range("a1") <> "" Then
Wb.Sheets(i).Range("a1").Resize(1, Sheets(i).UsedRange.Columns.Count).Copy .Cells(1, 1)
d = Wb.Sheets(i).UsedRange.Columns.Count
c = Wb.Sheets(i).UsedRange.Rows.Count - 1
wn = Wb.Sheets(i).Name
.Cells(1, d + 1) = "表名"
.Cells(e + 1, d + 1).Resize(c, 1) = MN & wn
e = e + c
Wb.Sheets(i).Range("a2").Resize(c, d).Copy .Cells(.Range("a1048576").End(xlUp).Row + 1, 1)
End If
Next
Wbn = Wbn & Chr(13) & Wb.Name
Wb.Close False
End With
End If
MN = Dir
Loop
Range("a1").Select
Application.ScreenUpdating = True
MsgBox "共合并了" & a & "个工作薄下全部工作表。如下：" & Chr(13) & Wbn, vbInformation, "提示"
End Sub