They ride bikes to the bus station.A. go…..on bikes B. go…..by bikes C. go…..by a bike

题目

They ride bikes to the bus station.A. go…..on bikes B. go…..by bikes C. go…..by a bike
答案是go…..on bikes 为什么?找出能替换画线部分的选项,划线部分是rides bike

答案

by 的话要用by bike（单数,不加a）
on的话要加a或复数形式,即 ：on a bike或on bikes