单项选择题

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 While m < n:n=n - m:Loop    Loop    MyFunc=m  End FunCtion

A.0
B.2
C.4
D.6