单选题 把窗体的KeyPreview属性设置为True，然后编写如下过程：
Private Sub Form_KeyDown(KeyCode As Integer,Shift As Integer)
Print Chr(KeyCode)
End Sub
Prirate Sub Form_KeyUp(KeyCode As Integer,Shift As Integer)
Print Chr(KeyCode+2)
End Sub
程序运行后，如果按“A”键，则输出结果为