一道英语选择题,选哪个,为什么?
问题描述：
一道英语选择题,选哪个,为什么?
The speed ______ light travels is said to be the maximum in the universe.
A.in which B.by which C.from which D.at which
答
选d at the speed 是固定搭配表示以.的速度 the speed(at which light travels)is said to be the maximum in the universe 括号内的是定语从句 我们可以造个句 the light travels at the speed of 3000000000 meters per second 这样你就明白了吧.