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Visual Basic语言程序设计单选题中等

以下哪个函数可以被调用，并且每次调用都会修改其内部变量？

APublic Function Add(a As Integer, b As Integer) As Integer
BPublic Sub Increase(ByRef x As Integer)
CPublic Function Multiply(a As Integer, b As Integer) As Integer
DPublic Function Initialize(a As Integer) As Integer
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