2. 编制一个对Single类型一维数组排序的Sub过程，该过程只能被本模块中其他过程所调用，其首句为___。
A. Sub f(a() As Single,n As Integer)
B. Public Sub f(a() As Single)
C. Private Sub f(a(n) As Single,n As Integer)
D. Public Sub f(a() As Single,n As Integer)
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