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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？
A.Public Function Add(a As Integer, b As Integer) As Integer
B.Public Sub Increase(ByRef x As Integer)
C.Public Function Multiply(a As Integer, b As Integer) As Integer
D.Public Function Initialize(a As Integer) As Integer
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答案
B
解析
Sub函数可以使用ByRef参数来修改外部变量的值，而Function函数返回值不会修改外部变量。
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