The speed____ which the car runs depengs on the road condition.这是关于定语从句的问题,横线中应填一个介词.
问题描述：
The speed____ which the car runs depengs on the road condition.
这是关于定语从句的问题,横线中应填一个介词.
答
at
车子以怎样的速度行驶取决于路况.
at which
源于at the speed of