GWD-29-Q26

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.

1. of all the other planets, each contributing according to their

2. of all the other planets, with each of them contributing according to their

3. all the other planets, each of which contributing according to its

4. all the other planets, each contributing according to its

5. all the other planets, each of which contribute according to their(答案D)

我想問的是這裡使用"all the other planets"不就暗示了前面的"sun"也是"planet"嗎？sun應該是a fixed star才對吧!

btw, 我個人的理解，A,B錯是因為(1)加了of combined，變成the combined gravitational pull of the sun and the combined gravitational pull of all the other planets.，錯誤、無combined對象(2)後方their無指代對象。不知道這樣的看法對不對，請指教！

A,B,E 錯在代名詞不該用their,一開始就可以先刪掉了。

我的理解是,C的句意和原句所要表達的不同，所以錯。

还是想问下 为什么不能有of？？？