21. A:Excuse me. I want to mail(郵寄)a letter. Do you have a(n) ______? I want to put my letter in it.
問題詳情
21. A:Excuse me. I want to mail(郵寄)a letter. Do you have a(n) ______? I want to put my letter in it.B:Yes, here you are. (A) mat (B) symbol (C) word (D) envelope