单击命令按钮时，下列程序代码的执行结果为( )。 Private Function PickMid(xStr As String)As Sting Dim tempStr As String Dim strLen As Integer TempStr=" " StrLen=Len(xStr) i=1 Do While i＜=strLen/2 tempStr=tempStr+Mid(xStr,i,1)+Mid(xStr,strLen-i+1,1) i=i+1 Loop PickMid=tempStr End Function Private Sub Command1_Click() Dim FirstStr As String FirstStr="abcdef" Print PickMid(FirstStr) End Sub

A．abcdef

B．afbecd

C．fedcba

D．defabc