Sub Change(x As Integer, y As Integer)
Dim t As Integer
t = x
x = y
y = t
Print x, y
End Sub
Private Sub Form_Click()
Dim a As Integer, b As Integer
a = 30: b = 40
Change a, b
Print a, b
End Sub
程序运行后，单击窗体，在窗体上显示的值是（ ）。
A、
30 40
30 40
B、
30 40
40 30
C、
40 30
40 30
D、
40 30
30 40
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