-- you take a bus to school?-- Yes but now I usually go to school on foot.A. Did use t

问题补充：

-- you take a bus to school?

-- Yes, but now I usually go to school on foot.

A. Did, use to

B. Were , used to

C. Do , use to

D. Did, used to

答案：

(答案→)A. Did, use to

B. Were , used to

C. Do , use to

D. Did, used to

解析：根据语境可知此句的含义是过去你经常乘车去上学吗。考查的是固定句型结构used to do sth表示过去常常做某事，现在不做了。其一般疑问句的结构要借助助动词did的形式，构成did sb use to do sth故选A。