单项选择题

下列程序的执行结果为
Private Sub Command1_Click( )
Dim FirStr As String
FirSt = "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 - i + 1, 1 )
i=i+1
Loop
Pat = tempStr
End Function

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