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。以下能实现该操作的事件过程是
A．Private SubText1_KeyPress(KeyAscii As Integer)
If KeyAscii＜65 or KeyAscii＞90 Then
MsgBox“请输入大写字母”
KeyAscii=0
End If
End Sub
B. Private Sub Text1_KeyDown( KeyCode As Integer,Shift As Integer)
If KeyCode ＜ 65 or KeyCode ＞ 90 Then
Msgbox“请输入大写字母”
KeyCode = 0
End If
End Sub
C. Private SuB Text1_MouseDown( Button AS Integer,_
Shift As lnteger,X As Single,Y As Single)
If Asc ( Text1. Text) ＜ 65 or Asc ( Text1.Text) ＞ 90 Then
Msgbox“请输入大写字母”
End If
End Sub
D. Private Sub Text1_Change(
)
If Asc(Text1.Text) ＞64 And Asc(Text1.Text) ＞9l Then
Msgbox“请输入大写字母”
End lf
End Sub