若要从磁盘上读一个文件名为“C:\T1.txt”的顺序文件,则应使用下列 程序段打开文件。 (A)Dim F As String F = "C:\T1.txt" FileOpen(1, F, OpenMode.Input) (B)Dim F As String F = "C:\T1.txt" FileOpen(1, "F", OpenMode.Input) (C)FileOpen(1,"C:\T1.txt", OpenMode.Output) (D)FileOpen(1, C:\T1.txt,OpenMode.Input)