By the time my mom _____ to our school, all others of my class ______ for home.

A．got, left

B．got, had left

C．had got, had left

D．had got, left

编写一过程将C盘中的Config.sys文件内容读出，并在文本框中显示出来。在窗体Form1上建立一个文本框Text1，将其MultiLine属性设置为True，ScrollBars属性设置为3-Both。给定的程序不完整，请将程序补充完整。
Option Explicit
Private Sub Form _Click()
Dim ch1 As String，fn As Integer
Dim Str As String
fn= 【13】
Open "C:\Config.sys" For Input As fn
Do While Not EOF( 【14】 )
Line Input #fn, ch1
Str = Str + chl+ vbCrLf
Loop
Text1.Text = 【15】
End Sub