在窗体中添加两个文本框，其名称分别为Text1和Text2;两个标签，其名称分别为Label1和Label2。编写程序，使得程序运行后，在文本框Text2中输入小写字母，能转换为比此字母的ASCII码小4的大写字母，结果显示在文本框Text1中。如输入“efg”，则输出的结果为“ABC”，能够实现上述功能的程序是

A．Private Sub Form Load()
Show
Text1．Text=" "
Text2．Text=" "
Text2．SetFocus
End Sub
Private Sub Text2_KeyDown(KeyCode As Integer，Shift As Integer)
Text1．Text=Chr(KeyCode-4)
End Sub
B．Private Sub Form_Load()
Show
Text1．Text=" "
Text2．Text=" "
Text2．SetFocus
End Sub
Private Sub Text2_KeyDown(KeyCode As Integer，Shift As Integer)
Text1．Text=Text1．Text+Chr(KeyCode-4)
End Sub
C．Private Sub Form_Load()
Show
Text1．Text=" "
Text2．Text=" "
Text2．SetFocus
End Sub
Private Sub Text2_Click(KeyCode As Integer，Shift As Integer)
Text1．Text=Text1．Text+Chr(KeyCOde-4)
End Sub
D．Private Sub Form_Load()
Show
Text1．Text=" "
Text2．Text=" "
Text2．SetFocus
End Sub
Private Sub Text2_Click(KeyCode As Integer，Shift As Integer)
Text1．Text=Chr(KeyCode-4)
End Sub