prep-1-130

wtylys

关于while和at same time一起用，我看姑且只能看作是固定用法了。。

balapupu

“The real issue with this question A is the modifier. The sentence is attempting to indicated that the chemical pollutants have gone unregulated since they were developed, a sentiment indicated clearly and correctly in answer choice B.

In answer choice (A) the modifier having does not clearly describe the pollutants. In fact, when the sentence is rewritten, having seems to most closely describe they, the subject of the clause (They, having gone virtually unregulated....., have introduced some 100,000 dangerous chemical pollutants).“  from manhattangmat
这么看来这道题中的they就有两个指代了，第一个指代Methods,第二个指代pollutants.

HDcoffee

To me a structure of the sentence has the following logic:

Industrialization and modern methods...have improved the standard of living...while introducing dangerous chemical pollutants...[polutants] have gone unregulated since they (pollutants) were developed...

using 2/3 rule:
While vs. but - While wins. so we can eliminate D&E
In C "which" modifies time
A says that "Industrialization and methods of insects contorol..having gone (sounding awkward at least) unregulated." I think the meaning is distorted.

So B wins.

h14zpsn

while后面的主谓应该省略了吧，I&M have improved the living standard while (they are) introducing 。。。。, prep 2007 中有写“while 引导从句时,如主从句的主语一致,且从句谓语又含有 be,则从句主语和 be 可省略。while 后可
直接跟现在分词、名词、形容词或介词短语。”

aigojackie

ps：怎么判断是methods还是pollutants go unregulated呀，我选了E（估计钻牛角尖了这题，但出不来了） 感觉就是having是做延伸修饰前面整句话的（but at the same time introduce some 100,000 dangerous chemical pollutants），然后句子本身是在说methods　ｕｎｒｅｇｕｌａｔｅｄ，这要比较有逻辑。。。

-- by 会员 ivyfeng (2009/9/23 17:59:00)

同意这样的说法~~怎么能很肯定地判断出go unregulated 的对象时methods or pollutants?  confused......

Sophia001

while和at the same time 不重复，因为在这里while只表示in the contrast的意思，表转折，并不是“同时的”意思。

lesley0927

while表示转折啊，为什么和at the same time重复了呢

反调戏

while introducing 是省略了（they are）还是while本来就可以连接句子和短语？

钱某人

16 17L正解

南风吹

xiaoqiaoli 发表于 2011-6-1 11:53
有个问题，正确答案中的while跟at the same time不是语义重复么？-- by 会员 jadedj (2008/8/2 17:44:00 ...

while在这里表示转折不是与此同时的意思，