下列程序的执行结果为
Private Sub Command1_Click()
Dim FirStr As String
FtrSt="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
A．abcdef
B．afbecd
C．fedcba
D．defabc
