单项选择题

下面程序：Private Sub Form_Click() Dim x,y，z As Integer x=5 y=7 2=0 Call P1(x,y，z) Print Str(z) End Sub Sub P1(By Va1 a As Integer，By Va1 b As Integer，c As Integer) c=a+b EndSub 运行后的输出结果为_________。

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