设在窗体上有一个文本框,然后编写如下的事件过程:Private Sub Text1_KeyDown(KeyCode As Integer, Shift As Intcger)Const Alt=4Const Key_f2=&H71altdown%=(Shift And Alt) > 0f2down% And f2down% ThenIf altdown% And f2down% ThenText = abl End IfEad Sub程序运行后,清除文本框中原有内容,如果按Shift+F2键,则在文本框中显示的是( )。
A. add()
B. requestFocus()
C. repaint()
D. paint()