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 becaust of mutual gravitational attraction.

A. repeated impacts broke the surface apart, and after which the fragments were subsequently rejoined becaust 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.

A.     and作連詞已經可以連接句子，and連接的兩個句子屬於同一層次；又出現after which再次扮演連 詞的成分，連接的句子屬於子句，與主句構成主從關係。因此，該選項句子結構混亂；

prep解释里是这样说的

有两个问题

(1) after不也可以当介词吗?

(2) 这里的which是指代什么?

看句义感觉是前面句子the surface broke apart

虽然每个选项都有which

可是which不能指代句子不是GMAT的天理吗?

还是另外有所指呢?

which指repeated impacts

after可当介词与连词。

谢谢~~~

那prep用这个(after为连词)当作删去答案的依据

是不是不太恰当啊

需要看题目而定，大部分SC的题目主要考点都只有一个或两个～而且很明确，

但就这题來说

我个人觉得考点比较小

A错在多了一个连词

B,C,D,E考两个点，第一个是用through比with或by更为准确，表示rejoin是透过相

互引力达到而不是被相互引力达到

第二个点比较不容易看出，是两个断句间的逻辑关系，前面一句应该先说明

surface经过...而broke,然后后一句

是说在repeated impact之后又重新rejoin.有点考分词样句修饰的味道

OA：E

你说的 A错在多一个连词

是指 and 跟 after吗?

那如果把after看作介词不就沒有这个问题了吗?

不好意思~~~

还是有点不了解

我看過了～另一題主要適用for來解題，因為for在該題中會造成ambiguity

例如：

the judge ban a law for preventing surf

到底是指法官禁止一個防止衝浪的法令呢？還是法官為了不給衝浪而禁止一個法令？

D跟E則是以時態判斷，D較好的原因是that enables....表示一個事實，指那個trick

的用處，用will比較不好，這是我個人用語感判斷。

after在這邊一定是當連詞的，因為介詞後面不能接子句，所以and + after造成redundancy.

希望對你有幫助.大家互相切磋

不好意思 我还是有一点点不了解

如果把after which当作介词片语 作为时间副词不可以吗?

对不起啊  脑袋还转不过來

另外那一题,我的问题是紅色的字部分 (不知道你是不是沒看到)

那一题 能不能移驾到那边讨论呢  呵~~~

先謝謝你了~~~