2007prep1 97 关于 while ， which指代的问题

MICCORAFA

1、while 与 at the same time 不算重复吗，都有同时的意思。
2、C选项中，while后面用完成时也是可以的吧。
3、C选项中的which那里指代错误了。

谢谢大家^_^

teddybearj4

LZ，建议你下次问问题的时候把题目贴上。

Industrialization and modern methods of insect control have improved the standard of living around the globe while at the same time they have introduced some 100,000 dangerous chemical pollutants, having gone virtually unregulated since they were developed more than 50 years ago.

(A) while at the same time they have introduced some 100,000 dangerous chemical pollutants, having

(B) while at the same time introducing some 100,000 dangerous chemical pollutants that have

(C) while they have introduced some 100,000 dangerous chemical pollutants at the same time, which have

(D) but introducing some 100,000 dangerous chemical pollutants at the same time that have

(E) but at the same time introducing some 100,000 dangerous chemical pollutants, having

OA：B


1、while这里有although、but的让步转折的意思在里面，与at the same time不重复。下面还有个例子也是相同用法，LZ可以体会一下：

a recent poll indicates that many people in the US hold a combination of conservative and liberal political views;they denounce big government, saying government is doing too much and has become too powerful, whileatthesametime supporting many specific government programs for health are, education, and the environment.

2、完成时的话没有标志词的时候一般都不用。

3、n.+comma+which和n.+ which/that的区别是前者是非限定性定语从句，后者是限定性定语从句。
C的意思就变成了所有的chemical pollutants都是unregulated的，而实际上语意应该是工业化现代化产生的chemical pollutants是unregulated的。

miho520

teddybearj4 发表于 2012-2-20 20:17
LZ，建议你下次问问题的时候把题目贴上。Industrialization and modern methods of insect control have im ...

你好，我想问下c选项，说C的意思就变成了所有的chemical pollutants都是unregulated的，那么在这里which指代的是 chemical pollutants 而不能是100,000 dangerous chemical pollutants吗？