题目内容：

we usually go to school ____bus,but today we don`t____bus to school ,we walk to school.

优质解答

by take (a)

追问：

A、by bus, by bus　　B、take a bus, by a bus C、by bus, take buses D、by buses take a bus 　　以上四个答案应该选哪个正确。请说一下理由。谢谢

追答：

选C