问题详情

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
A.abcdef
B.afbecd
C.fedcba
D.defabc 请帮忙给出正确答案和分析，谢谢！