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

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
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

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
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.