下列程序中，第一个Do语句共执行了（）次循环。
Dim i As Integer, j As Integer
i = 1 Do
j = 1
Do
Sum = Sum + j
j = j + 2
Print j;
Loop Until j > 3
i = i + 2
Loop Until i > 10
Print Sum

A.10
B.20
C.5
D.7