单项选择题

若有以下两个过程：
Sub S1(ByVal x As Integer，ByVal y As Integer)
Dim t As Integer
t=x
x=y
y=t
End Sub
Sub S2(x As Integer，y As Integer)
Dim t As Integer
t=x:x=y:y=t
End Sub
则下列说法中，正确的是______。

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