He used to go swimming in the river, _______?

问题描述:

He used to go swimming in the river, _______?
(A) didn't he
(B) wasn't he
(C)wouldn't he
(D) weren't he

选(A) didn't he
used to do sth固定用法,表示过去常常做某事 ,题目表示的是过去的事情,用的时态是一般过去时,且前面的意思是可能,所以后面用didn't