Translation:I am sorry. You can't return this.
Based on the hints given, I put "I am sorry, you can't return." What part implies "this"? Why can't Duo hint at it? (Or is my translation actually right?)
It's just because you can't have objectless sentences with transitive verbs in English but you can in Chinese.
I think this excersice needs a specific noun the first time we see the verb “退货”. I thought the answer was “I'm sorry, you can't return” meaning “you can't come back here” or “you're banned from here” I need “你不可以退货这双鞋子” or something to show which sense of the english word “return” “退货” means