在C盘当前文件夹下有一个已建立好的顺序文件Alph.txt，文件内容为只含有字母的一个字符串(有双引号界定符)。单击窗体，打开Alph.txt文件，读取字符串并显示在文本框Text1中，然后调用StrSort过程将此字符串按ASCII码的顺序重新排列并显示在文本框Text2中，最后将重新排列的字符串存入AlpO.txt文件中(无双引号界定符)。请选择横线处合适的语句( )。Private Sub Form_Load()Dim StrIn As String,StrOut As StringsOpen C: Alph.txt For Input As #1______CloseText1.Text=StrIn______Text2.Text=StrOutOpen C: AlpO.txt For Output As#2______CloseEnd SubPrivate Function StrSort(s As String)As StringDim s Arr() As String *1,i As Integer,j As Integer,n As IntegerDim t As String *1n=Len(s)ReDim sArr(n)For i=1 To ns Arr(i)=Mid(s,i,1)Next iFor i=1 To n-1For j=i+1 To nIf sArr(i)＞sArr(j) Thent=sArr(i):sArr(j):sArr(j):sArr(j)=tEnd IfNext j,iFor i=1 To nStrSort=StrSort & s Arr(i)Next iEnd Function
A．Input#1,StrIn StrIn Print#2,StrOut
B．Input#1,StrIn StrSort(StrI Input#2,StrOut
C．Input#2,StrIn StrSort(StrI Input#1,StrOut
D．Print#1,StrIn StrSort(StrI Input#2,StrOut