A.Private Sub Text1_KeyPress(KeyAscii As Intege 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 Intege 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 Integer, X As Single, Y As Singl If Asc(Text1.Tex < 65 Or Asc(Text1.Tex > 90 Then MsgBox "请输入大写字母" End If End Sub D.Private Sub Text1_Change() If Asc(Text1.Tex > 64 And Asc(Text1.Tex < 91 Then MsgBox "请输入大写字母" End If End Sub