题目内容：

--You father didn't give up smoking,did he?--____That's why he becomes healthier than before
Ano,he didn't Byes,he did Cno,he did Dyes,he didn't

优质解答

B. yes,he did
在英语里,如果有人这么问“Don't you konw ?"（你不知道吗?)如果回答"yes, I do."意思是(不,我知道）,如果回答"no, I don't",意思就是（对,我不知道）.
这里同理.