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，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 String Open C: Alph.txt For Input As #1 ______ Close Text1.Text = StrIn ______ Text2.Text = StrOut Open C: AlpO.txt For Output As #2 ______ Close End Sub Private Function StrSort(s As String) As String Dim sArr() As String * 1, i As Integer, j As Integer, n As Integer Dim t As String * 1 n = Len(s) ReDim sArr(n) For i= 1 To n sArr(i) = Mid(s, i, 1) Next i For i= 1 To n-1 For j =i+1 To n If sArr(i)＞sArr(j) Then t = sArr(i): sArr(i) = sArr(j): sArr(j) = t End If Next j, i For i= 1 To n StrSort = StrSort & sArr(i) Next i End Function
A．Input #1, StrIn StrIn Print #2, StrOut
B．Input #1, StrIn StrSort(StrI Print #2, StrOut
C．Input #2, StrIn StrSort(StrI Print #1, StrOut
D．Print #1, StrIn StrSort(StrI Input #2, StrOut