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【单选题】
有下列两个过程： 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 则下列叙述中正确的是( )。A.
用过程S1可以实现交换两个变量的值的操作，S2不能实现
B.
用过程S2可以实现交换两个变量的值的操作，S1不能实现
C.
用过程S1和S2都可以实现交换两个变量的值的操作
D.
用过程S1和S2都不能实现交换两个变量的值的操作
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