从1号顺序文件中把所有数据读出来送入文本框TextBox1，正确的程序段是________。 A: Do While Not EOF(1) str = LineInput(1) TextBox1.Text = TextBox1.Text + str + vbCrLfLoop B: Do While EOF(1) str = LineInput(1) TextBox1.Text = TextBox1.Text + str + vbCrLfLoop C: Do While Not EOF(1) str = LineInput(1) TextBox1.Text = TextBox1.Text + strLoop D: Do While Not EOF(1) str = LineInput(1) TextBox1.Text = str + vbCrLfLoop