prep1-3看过以前的讨论，还是头大头大头大~~~谁来救火~~~快上战场了！

ruimiss

Less than 35 years after the release of African honeybees outside Sao Paulo, Brazil, their descendants, popularly known as killer bees, had migrated as far north as southern Texas.
(A) Less than 35 years after the release of African honeybees outside Sao Paulo, Brazil,
(B) In less than 35 years since releasing African honeybees outside Sao Paulo, Brazil,
(C) In less than the 35 years since African honeybees had been released outside Sao Paulo, Brazil,
(D) It took less than 35 years from the release of African honeybees outside Sao Paulo, Brazil, when
(E) It took less than the 35 years after the time that African honeybees were released outside Sao Paulo, Brazil, and then

答案是A,不懂啊不懂，为什么C不可以。到底几个选项间的差别是什么？？？考点在哪里？？？？

我讨厌SC~~~~~~~~~~~~哭泣~~~~~~~~~

ruimiss

DDDDDDDDDDDDDDDD~~~~~~

忽然忘了解脱

LZ没看语法笔记！？

sophiacxl

这道题是集合多个考点在一身的，所以看起来有点晕~

根据下面的帖子的讨论，翻译了一下，希望能帮到楼上的~
http://www.manhattangmat.com/forums/gmatprep-question-need-help-t1864.html

在B选项中，“releasing”该动作的发出者是未划线部分中的“their descendants”, 代入原文，“their descendants” “releasing African honeybees”，翻译为后代release祖先，LZ肯定能看出来这在逻辑上是不对的，对应OG中提到的modification problems；

C选项，由于未划线部分的句子使用了过去完成时，所以“since”引导的从句应该使用一般过去时。对应OG中提到的verb form的语法知识；

D选项代入原文后，“when...”引导的句子修饰“the release of African honeybees...”，意思是当their descendants had migrated as far north as southern Texas，发生了“the release of African honeybees...”，但根据原文及逻辑关系可知道这是错误的；并且句首的“it”在文中找不到指代的对象；

E选项句首的"it"没有指代的对象，"the time that"在文中多余。

sophiacxl

帖子里的NN说，A选项中改为“In less than 35 years”更合适~但相比较其他答案，A选项相对最正确的~

ruimiss

看了呀~~可是看了还是不明白啊。。。额。。。

sophiacxl

LZ关于解释的哪个部分不明白？

ruimiss

我瞬间糊涂了。是不是since只能用现在完成时？过去完成时确定不行的？？？做题有点做傻掉了。。。我选的是C,我觉得after后面的那个主句都是用过去完成时，那么前面这句不是更应该是过去的过去了？不是也应该过去完成时么？

aeoluseros

我瞬间糊涂了。是不是since只能用现在完成时？过去完成时确定不行的？？？做题有点做傻掉了。。。我选的是C,我觉得after后面的那个主句都是用过去完成时，那么前面这句不是更应该是过去的过去了？不是也应该过去完成时么？

-- by 会员 ruimiss (2010/4/29 16:50:21)

prep语法笔记解释错了. since应该是用于完成时，包括过去完成时，而不仅是现在完成时

ruimiss

那为什么我不能选C呢?????