登录窗体如图所示。单击"登录"按钮，当用户名及密码正确时则会弹出窗口显示"OK"信息。 <br/><img src="https://questionlib.net/images/qs/ms17-27-1.png"/> 下列过程不能完成此功能的是

A.Private Sub cmdOK_Click() If txtUser.Value = "zhangs" And txtPW.Value = "123" Then MsgBox "OK" End if End Sub
B.Private Sub cmdOK_Click() If txtUser.Value = "zhangs" Then If txtPW.Value = "123" Then MsgBox "OK" End if End if End Sub
C.Private Sub cmdOK_Click() If txtUser.Value = "zhangs" Then If txtPW.Value = "123" Then MsgBox "OK" End if End Sub
D.Private Sub cmdOK_Click() If txtUser.Value = "zhangs" and txtPW.Value = "123" Then MsgBox "OK" End If End Sub

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参考答案：A

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end

sub