单项选择题

下列程序的执行结果为( )。
Private Sub Command1_Click()
Dim FirStr As String
FirStr="abcdef"
Print Pat(FirStr)
End Sub
Private Function Pat(xStr As String) As String
Dim tempStr As String, strLen As Integer
tempStr=""
strLen=Len(xStr)
i=1
Do While i＜＝Len(xStr)-3
tempStr=tempStr+Mid(xStr,i,1)+Mid(xStr, strLen -1+1,1)
i=i+1
Loop
Pat=tempStr
End Function

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