运行下列程序：Private Sub form_Click( )x$ = 123: y$ = abcn = Len(x)For i = 1 To nPrint Mid(x$, n + 1 - i, 1) + Mid(y$, i, 1);Next iPrintEnd Sub单击窗体后，则输出结果是( )。A.a1b2c3B.a3b2c1C.3a2b1cD.1c2b3a
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
End Sub
单击窗体后，则输出结果是( )。
A.a1b2c3
B.a3b2c1
C.3a2b1c
D.1c2b3a
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