在窗体上画一个命令按钮和两个文本框,其名称分别为Command1、Text1和Text2,在属性窗V1中把窗体的KeyPreview属性设置为True,然后编写如下程序: Dim S1 As String,S2 As String Private Sub Form_Load() Text1.Text=”” Text2.Text=”” TeXt1.Enabled=False Text2.Enabled=False End Sub Private Sub Form_KeyDown(KeyCode As Integer,Shift As Integer) S2=S2&Chr(KeyCode) End Sub Privtee Sub Form_KeyPress(KeyAscii As Integer) S1=S1&Chr(KeyAscii) End Sub Pfivtee Sub Command 1_Click() Text1.Text=S1 Text2.Text=S2 S1=”” S2=”” End Sub 程序运行后,先后按“a”、“b”、“c”键,然后单击命令按钮,在文本框Text1和Text2中显示的内容分别为( )。