问题详情

运行下列程序：
Private Sub form_Click()
x$ = "123": y$ = "abc"
n = Len(x)
For i = 1 To n
Print Mid(x$, n + 1 - i, 1) + Mid(y$, i, 1);
Next i
Print
End Sub
单击窗体后，则输出结果是()。
A.a1b2c3
B.a3b2c1
C.3a2b1c
D.1c2b3a