--does your brother go to work?-- By bike.A. Where B. Why C. How

问题补充：

--does your brother go to work?

-- By bike.

A. Where B. Why C. How

答案：

解析：Where在哪儿;Why为什么;How如何,怎样.根据下文,乘自行车.可知上文问的是,你的哥哥怎么去上班?故选C.