[单项选择题] 有下列程序: Private Sub Command1_Click()X$="Nanchang"y$="Beijing"z$="Na
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[单项选择题] 有下列程序: Private Sub Command1_Click()X$="Nanchang"y$="Beijing"z$="Nanjing"z$=InStr(Left(x$,3)+Right(y$,4),z$)Print z$ End Sub 程序运行后,单击命令按钮,则窗体上显示的内容是
A.0
B.1
C.3
D.4
参考答案: