在窗体上画一个名称为Text1的文本框，要求文本框只能接收大写字母的输入。以下能够正确实现该操作的事件过程是______ 。
A．Private Sub Text1_ KeyPress (KeyAscii As Intege IfKeyAscii ＜ 65 Or KeyAscii ＞ 9t Then MsgBox “请输入大写字母” End If End sub
B．Private Sub Text1_ KeyDown (KeyCode As Integer, Shift As Intege IfKeyCode ＜ 65 Or KeyCode ＞ 91 Then MsgBox “请输入大写字母” End If End sub
C．Private Sub Text1_ MouseDown (Button As Integer, _ Shift As Integer, X As Single, YAs Singl IfAsc (Text1.Tex ＜ 65 Or Asc (Text1. Tex ＞ 91 Then MsgBox “请输入大写字母” End If End sub
D．Private Sub Text1_ Change() IfAsc(Text 1.Tex ＜ 65 Or Asc(Text1. Tex ＞ 91 Then MsgBox “请输入大写字母” End If End sub