编写如下程序: Private Sub Form. Click() a$=: '4321': b$='abcd' For 3=1 To 4 Print Mid$(a$,5-j,1)+Nid$(b$, j, 1); Next j Print End Sub 程序运行后,单击窗体,其输出结果为 ______。
A.
alb2c3d4
B.
b4c3d2el
C.
eld2c3b4
D.
la2b3c4d
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举一反三
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