He used to to school by bike but he is used to to school now.Ago; walking B．go; walk C．go

问题补充：

He used to to school by bike but he is used to to school now.

A．go; walking B．go; walk C．going; walk

答案：

解析：be used to sth习惯于某事;used to do sth过去常常做某事.句意:他过去常常骑自行车去学校。但是他现在习惯了步行去学校。故选A。