Did you use to play the piano?______________.A、 Yes,I do  B、 No,I didn't  C、 Yes,I play it every day  D、 No,I do 

问题描述:

Did you use to play the piano?______________.A、 Yes,I do  B、 No,I didn't  C、 Yes,I play it every day  D、 No,I do 

选B,因为did是助动词 而use to do 本是 used to do sth 是指过去常常做某事的意思 ,因为是过去式,用did提问,回答是 主语 +did主语 + didn't,因为是用Did 问的,所以用did答