A solar day is the length of time ____ the earth to revolve once around the sun.

问题描述:

A solar day is the length of time ____ the earth to revolve once around the sun.
A.takes B.takes it C.he takes D.it takes
正确答案是什么,怎样翻译啊?

答案d
意思:日周期就是地球围绕太阳一周的时间.