2019-2020学年度外研版必修一Modue4A social survey-My Neighbourood Period Three Grammar & Writing课件(34张)
2019-2020学年度外研版必修一Modue4A social survey-My Neighbourood Period Three Grammar & Writing课件(34张)第3页

Passenger A: I have already shown my tickets. (The conductor left.) Passenger B: I showed my ticket just now, but now I can’t find it. (Passenger B had to buy another ticket.)

Why?