He used to take a walk after supper each day,___?A.did he B.was he C.usedn't he D.wasn't he

He used to take a walk after supper each day,___?A.did he B.was he C.usedn't he D.wasn't he
He used to take a walk after supper each day,___?
A.did he B.was he C.usedn't he D.wasn't he

He used to take a walk after supper each day,___?A.did he B.was he C.usedn't he D.wasn't he
C
填didn't he也可以.

我觉得答案好像都不对，非要选的话可能是C吧