题目内容：
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。以下能实现操作的事件过程是（ ）
A．Private Sub Text1_KeyPress(KeyAscii As Integer)If KeyAscii<65 0r KeyAscii>90 Then
MsgBox”请输入大写字母”
KeyAscii=0
End If
End Sub
B．Private Sub Text1_KeyDown(KeyCode As Integeq Shift As Integer)
If KeyCode<65 0r 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 Single)
If Asc(Text1.Text)<65 0r 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)<91 Then
MsgBox“请输入大写字母”
End If
End Sub
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答案解析：