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问题: CET6 2007年12月 第67题 为什么选ones

原题如下:
He(Einstein) was struggling to find the right equations that would describe his new concept of gravity,______that would define hou objects move through space and how space is curve by objects.
A)ones B)those C)all D)none
答案是A,为什么呢?

解答:

ones指的就是equations,这里的ones that就相当于which引导的定语从句