prep 1-97

charlie6989

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

Ans:B

笔记：Ｄ(D) but introducing不能和have improved构成并列
小弟此处认为有些疑问
参考ＯＧ11#15
The Iroquois were primarily planters, but supplementinq their cultivation of maize, squash, and beans with fishing and hunting.
(A)    but supplementing
(B)    and had supplemented
(C)    and even though they supplemented
(D)    although they supplemented  
(E)    but with supplementing

OG解释
The participle supplementing would normally be expected to modify the first clause, describing or extending its meaning, but the logic of this sentence demands a contrast, not an extension
不管前者连接词是否为转折用词  , 后面有-ing分词就会被认为延伸前句
大家来讨论看看小弟理解是否有误

charlie6989

ding

Zeldaw

 D is wrong because of "at the same time."

D的意思变成能够同时排出10000种化学物质。

B的意思是在带来方便的同时，排出10000种化学物质。

charlie6989

所以是修饰一个是向前句做修饰,一个修饰对象变成at the same time
是这样解释吗？

fangxia76

GOOD POINT

zuozuox

以下是引用charlie6989在2008-10-8 20:23:00的发言：
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

Ans:B

笔记：Ｄ(D) but introducing不能和have improved构成并列
小弟此处认为有些疑问
参考ＯＧ11#15
The Iroquois were primarily planters, but supplementinq their cultivation of maize, squash, and beans with fishing and hunting.
(A)    but supplementing
(B)    and had supplemented
(C)    and even though they supplemented
(D)    although they supplemented  
(E)    but with supplementing

OG解释
The participle supplementing would normally be expected to modify the first clause, describing or extending its meaning, but the logic of this sentence demands a contrast, not an extension
不管前者连接词是否为转折用词  , 后面有-ing分词就会被认为延伸前句
大家来讨论看看小弟理解是否有误

But可以做连词也可以做副词。

A选中形式，but只能是副词，而but的副词意思是only，所以A不对。

所以LZ的理解有误。

个人理解，请NN指正。

题外话，CD发帖编辑不支持firefox真的很不方便~~~

[此贴子已经被作者于2009-5-19 22:18:21编辑过]

AlienX

umm...會和上層反映一下(我也是用firefox...)

lijiahui0422

firefox装个插件就和可以在右下交随时切换了~

另外 but 能做副词么？没见过...

AlienX

Longman's example:
It's going to be difficult. Anyway, we can but try.

亲亲麦小兜

UP一下，我有同样的疑问：but doing这个结构到底对不对呢