题目内容
在窗体上画一个名称为Command1的命令按钮，然后编写下列事件过程： Private Sub Command1Click() C=1234 c1=Trim(Str(c)) For i=1 To 4 Print Next End Sub 程序运行后，单击命令按钮，要求在窗体上显示下列内容：1 12 123 1234 则在横线处应填入的内容为( )。
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窗体上有一个名称为Command1的命令按钮，其单击事件过程及有关函数过程如下： Private Sub Command1 Click() Dim n As Integer n=add(5，10) Print n End Sub Function add(v1 As Integer，v2 As Integer，Optiona1 v3)As Integer If Not IsMissing(v3)Then add=v1+v2+v3 Else add=v1+v2 End If End Function 运行程序，单击命令按钮，以下叙述中正确的是( )。
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