设在窗体上有个文本框，然后编写如下的事件过程：
Private Sub Text1_KeyDown(KeyCode As Integer, Shift As Integer)
Const Alt=4
Const Key_F2=&H71
altdown%=(Shift And Alt)＞0
t2down%=(KeyCode:Key_F2)
If altdown% And f2down% Then
Text1.Text="BBBBB"
End If
End Sub
上述程序运行后，如果按Shift+F2键，则在文本框中显示的是( )。

As Integer,X As Single,Y As Single)
Print "Down"
End Sub
Private Sub Form_MouseUp(Button As Integer, Shift_As Integer,X As Single,Y As Single)
Print "Up"
End SubA) DownUpClick
B) ClickDownUp
C) DownClickUp
D) UpDownClick

A) 整个程序的所有模块中
B) 该窗体模块中
C) 标准模块中
D) 其他窗体模块中