若看到程序中有以下事件过程,则可以肯定的是,当程序运行时 Private SubClick_MouseDown(Button As Integer,Shift As Integer,X As Single,Y As Single) Print "VB Program" End Sub A) 用鼠标左键单击名称为"Command1"的命令按钮时,执行此过程 B) 用鼠标左键单击名称为"MouseDown"的命令按钮时,执行此过程 C) 用鼠标右键单击名称为"MouseDown"的控件时,执行此过程 D) 用鼠标左键或右键单击名称为"Click"的控件时,执行此过程