单击命令按钮时，下列程序代码的运行结果为 Private Sub Command1_Click() Print MyFunc(20, 18) End Sub Public Function MyFunc(m As Integer, n As Integer)As Integer Do While m＜＞n Do While m＞n:m=m-n:Loop Do Whle m＜n:n=n-m:Loop Loop MyFunc=m End Function

A．0

B．2

C．4

D．6