单选题：设有如下过程：Private Sub Form KeyDpwn(KeyCode As Integer,Shift As

设有如下过程：
Private Sub Form KeyDpwn(KeyCode As Integer,Shift As Integer)
Print Chr(KeyCode)
End Sub
Private Sub Form KeyUp(KeyCode As Integer,Shift As Integer)
Print Chr(KeyCode+2)
End Sub
若把窗体的KeyPreview属性设置为True，程序运行后，如果按“A”键，则输出结果为（　　）。 A．A
A
B．A
B
C．A
C
D．A
D