问题详情

单击命令按钮时，下列程序段的执行结果为()。 Private Sub Command1_Click() Dim FirstStr As String FirstStr="abcdef" Print PickMid(FirstStr) End Sub Private Function PickMid(xStr As String)As String Dim tempStr As String,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 Funcfion
A．abcdef
B．fed
C．fedcba
D．defabc请帮忙给出正确答案和分析，谢谢！