有如下程序： Private Sub Command1_Click() Dim i
题型：单项选择题
问题：
有如下程序：
Private Sub Command1_Click()
Dim i As Integer, j As Integer
Dim sum As Integer
n=1
Do
j=1
Do
sum = sum + j
j=j+1
Print j;
Loop Until j ＞ 3
n=n+2
Loop Until n ＞ 10
Print sum
End Sub
运行上述程序，外层Do循环执行的次数为( )。
A) 4
B) 5
C) 7
D) 10