在窗体中添加一个通用对话框Commondialog1和一个命令按钮Command1,当单击按钮时,打开颜色对话框,能实现此功能的程序段是
A.Private Sub Command1_Click()
Commondialogl.ShowOpen
End Sub
B.Private Sub Command1_Click()
Commondialog1.ShowColor
End Sub
C.PrivateSubCommand1_Click()
Commondialog1.ShowOpen
Commondialog1.ShowFont
End Sub
D.Private Sub Command1_Click()
Commondialog1.ShowColor
Commondialog1.ShowHelp
End Sub