PREP语法(findjuhl整理的55题)

adpang

55. 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 pollutant, having

answer B

划线部分的while后introducing some 100000 dangerous chemical pollutants是什么成分？　while 之后对句子结构有什么要求？做题时候就是以为while之后要跟句子才没有选B

基础太差。。。。

adpang

UP

adpang

再UP

adpang

再再顶，呼唤NN

abort

不是nn，但是记得某个讲过，while引导从句时，如果主从句主语一致，且从句谓语又含有be，那么while之后可省略主语＋be，讲动词改为ving形式，但是这里的谓语含有have，那不知道是不是应该说谓语含有助动词的时候可以这样改！继续讨论

fiftycents86

having在Gmat中不可做动词ing形式出现,出现必错,要把其改为that+从句形式, while后可以跟v+ing形式,而but后不可以

fansiyg

请看OG10 233的C选项，说得很清楚了

benja

问下，since they were developed more than 50 years ago.

这个they指代的是什么？

lachance

以下是引用benja在2007-7-18 21:49:00的发言：

问下，since they were developed more than 50 years ago.

这个they指代的是什么？

指代主语的主语

Industrialization and modern methods

onward123456

以下是引用lachance在2007-7-31 21:06:00的发言：

指代主语的主语

Industrialization and modern methods

根据答案，我觉得此处they应该指代pollutants吧。因为that后整个是修饰pollutants的。所以不能选A，因A中第一个they指的是主句主语：industrialization and modern methods

while at the same time introducing some 100,000 dangerous chemical pollutants that have gone virtually unregulated since they were developed more than 50 years ago.

请nn指正！

[此贴子已经被作者于2007-9-12 21:51:55编辑过]