Didn’t your brother go to school by bike?Yes he did. But he walking to school n

问题补充：

--- Didn’t your brother go to school by bike?

--- Yes, he did. But he walking to school now.

A. used to; used to

B. use to; used to

C. used to; is used to

D. use to; is used to

答案：

A. used to; used to

B. use to; used to

(答案→)C. used to; is used to

D. use to; is used to

解析：句意:-你的弟弟过去经常骑自行车上学吗？-是的。但是他现在习惯了走路上学。used to 后跟动词的原形，意思是：过去常常做某事；be used to 后跟动词的-ing形式，意思是：习惯于某事。根据句意可知选C。