单选题对窗体编写如下事件过程： Private Sub Form_MouseDown（Button As Integer，Shif tAs Integer，X As Single Y As Single） If Button=2 Then Print "AAAAA" End If End Sub Private Sub Form_MouseUp（Button As Integer，Shift As Integer，X As Single，Y As Single） Print "BBBBB" End Sub 程序运行后，如果单击鼠标右键，则输出结果为（）AAAAAABBBBBBCAAAAA CR BBBBB（其中CR表示回车和换行）DBBBBB CR AAAAA
单选题
对窗体编写如下事件过程： Private Sub Form_MouseDown（Button As Integer，Shif tAs Integer，X As Single Y As Single） If Button=2 Then Print "AAAAA" End If End Sub Private Sub Form_MouseUp（Button As Integer，Shift As Integer，X As Single，Y As Single） Print "BBBBB" End Sub 程序运行后，如果单击鼠标右键，则输出结果为（）
A
AAAAA
B
BBBBB
C
AAAAA CR BBBBB（其中CR表示回车和换行）
D
BBBBB CR AAAAA
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单选题对窗体编写如下事件过程： Private Sub Form_MouseDown（Button As Integer，Shif tAs Integer，X As Single Y As Single） If Button=2 Then Print "AAAAA" End If End Sub Private Sub Form_MouseUp（Button As Integer，Shift As Integer，X As Single，Y As Single） Print "BBBBB" End Sub 程序运行后，如果单击鼠标右键，则输出结果为（）AAAAAABBBBBBCAAAAA CR BBBBB（其中CR表示回车和换行）DBBBBB CR AAAAA
单选题对窗体编写如下事件过程： Private Sub Form_MouseDown（Button As Integer，Shift As Integer，X As Single Y As Single） If Button=2 ThenPrint"AAAAA"End IfEnd SubPrivate Sub Form_MouseUp（Button As Integer，Shift As Integer，X As Single，Y As Single） Print"BBBBB" End Sub程序运行后，如果单击鼠标右键，则输出结果为（）AAAAAABBBBBBCAAAAA CR BBBBB（其中CR表示回车和换行）DBBBBB CR AAAAA