在窗体上画一个命令按钮，然后编写如下事件过程：

Private Sub Command1_Click()

For i=1 To 4

x=4

For j=1 To 3

X=3

For k=1 To 2

x=x+6

Next

Next

Next

Print x

End Sub
程序运行后，单击命令按钮，输出的结果是

A．DownUpClick
B．ClickDownUp
C．DownClickUp
D．UpDownCliek

设已经在菜单编辑器中设计了窗体的快捷菜单，某顶级菜单为a1，且取消其“可见”属性。运行时，哪个事件过程可以使快捷菜单的菜单项响应鼠标左键单击和右健单击的事件过程是
Ａ) Private Sub Form_MouseDown(Button As Integer，Shift As Integer，X As Single，Y As Single)
If Button=2 Then PopupMenu a1，2
End Sub
Ｂ) Private Sub Form_MouseDown(ButtonAsInteger，ShiftAsInteger，X As Single，Y As Single)
PopupMenu a1，0
End Sub
Ｃ) Private Sub Form_Mouse Down(Button As Integer，Shift As Integer，X As Single，Y As Single)
PopupMenu a1
End Sub
Ｄ) Private Sub Form_MouseDown(Button As Integer，Shift As Integer，X As Single，Y As Single)
If(Button=vbLetfButton) Or (Button=vbRightButton) Then PopupMenu a1
End Sub