Which of the following can replace the word "unclog" in Para. 7？A．fix.B．clear.C．hinder.D．d

Which of the following can best reflect the theme

Which of the following can explain the worddupli

Which of the following can be best inferred from

Which of the following can be used to replace the

Which of the following can be best inferred from

Which of the following can be best inferred from