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。
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