在窗体上画一个名称为Command1的命令按钮，然后编写如下程序：
Dim k As Integer
Private Sub Form_Load()
k=15
End Sub
Private Sub Command1_Click()
Dim b As Integer
b=b+k
k=k+1
Print k,b
End Sub
程序运行时，两次单击命令按钮Command1后，在窗体上输出的第二行是( )。
A．17 31
B．15 31

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