---Does your brother usually walk to school?---Yes. But sometimesbikeA. byB. in C. with

问题补充：

---Does your brother usually walk to school?

---Yes. But sometimesbike．

A. byB. in C. with

答案：

解析：句意：你的弟弟通常走路是学校吗？是的，但是，有时候也骑自行车。by bike骑自行车，固定结构，故选A.

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