Prep-T2-Q88

[charlie6989]

Because Miranda, the smallest moon of Uranus, has a large number of different surface features, including craters, mountains, valleys, and fractures, some astronomers suggest that at one time repeated impacts broke the surface apart, and after which the fragments were subsequently rejoined because of mutual gravitational attraction.

(A) repeated impacts broke the surface apart, and after which the fragments were subsequently rejoined because of
(B) repeated impacts on the surface broke it apart, after which the fragments having rejoined with
(C) through repeated impacts that the surface broke apart, after which the fragments subsequently rejoined by
(D) the surface broke apart with repeated impacts, after which the fragments having rejoined through
(E) the surface broke apart as a result of repeated impacts, after which the fragments rejoined through

1)請問這題的解題思路
2)並想請問B)it指代是否不清,若有 請問其指代對象為？？
3) B）C)PREP解答上說其結構出現問題,請問是哪邊出現問題？？

[edas9101]

http://www.formosamba.com/phpBB3/viewtopi ... rep-T2-Q88

這裡有