设有如下程序代码: Private Sub Command1_Click () Dim Sname As String, SNo As String, Score As Single Open "D:\Score.txt" __________ As #1 SNo = InputBox ( " 输入学号: " ) Sname = InputBox ( " 输入姓名: " ) Score = Val ( InputBox ( " 输入成绩: " )) Print #1, SNo, Sname, Score Close #1 End Sub 以上程序的功能是:向文件 D:\Score.txt 中写入一名同学的学号、姓名和成绩,当文件不存在时,新建该文件;当文件存在时,覆盖原文件的内容。在横线处应填入的内容是 ( ) 。