单项选择题

设有命令按钮Command1的单击事件过程，代码如下：
Private Sub Command1_Click()
Dim a(3,3) As Integer
For i=1 To 3
For i=1 To 3
a(i,j)=i*j+i
Next j
Next i
Sum=0
For i=1 To 3
Sum=Sum+a(i,4-i)
Next i
Print Sum
End Sub
运行程序，单击命令按钮，输出结果是

点击查看答案&解析