Do you go to work by bus ? _______ A .yes,but I did B.No,but I do C.No,but I used toD.No,but I did not

Do you go to work by bus ? _______ A .yes,but I did B.No,but I do C.No,but I used toD.No,but I did not
Do you go to work by bus ? _______ A .yes,but I did B.No,but I do C.No,but I used to
D.No,but I did not

Do you go to work by bus ? _______ A .yes,but I did B.No,but I do C.No,but I used toD.No,but I did not
选C No,but I used to
Do you go to work by bus?
你经常坐公交车上班?
No,but I used to.
没有,但是以前是.

C “不是，但曾经是。”
Used to do sth 过去常常做某事

C

答案选C.No,but I used to
不是，但是我过去常（坐公共汽车）。
Used to do sth 过去常常做某事