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=0End IfEnd 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 = 0End IfEnd 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 IfEnd 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 lfEnd Sub