Prep2012-Pack1-SC-039 Medium平行题目，什么时候要省略介词，什么时候不该省略？

Farahah

In his experiments with gravity, Isaac Newton showed how the motion of each planet in the solar system results from the combined gravitational pull of the Sun and of all the other planets, each contributing according to their mass and distance from the others.

(A) of all the other planets, each contributing according to their
(B) of all the other planets, with each of them contributing according to their
(C) all the other planets, each of which contributing according to its
(D) all the other planets, each contributing according to its
(E) all the other planets, each of which contribute according to their

答案说：因为平行的是the sun和 all the other planets， 所以不加of，如果加了of就是each planet in the solar system 和 all the other planet平行，不懂，
是因为conbine sth of A&B 是固定搭配才省略of吗？推而广之，平行题目，什么时候要省略介词，什么时候不该省略？ 这个问题深深困惑我好久了。

Farahah

自己顶一个！求大神路过

Bradz

combination一般来讲都是combination of a and b的形式，特别是a或者b是单数的时候，因为只有两个事物在一起才能算combination，一个事物怎么combine呢？这里第二个of不是省略，是不能有。

Farahah

Bradz 发表于 2016-11-21 23:27
combination一般来讲都是combination of a and b的形式，特别是a或者b是单数的时候，因为只有两个事物在一 ...

非常感谢！！！