GWD题不懂，求助！

azhongzhong

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, and have
    
D but introducing some 100,000 dangerous chemical pollutants at the same time that have
    
E but at the same time introduce some 100,000 dangerous chemical pollutants, having

balapupu

选B 哪不懂呢？？

azhongzhong

我选的D,在B、D中纠结，当时做题时认为While 也表示同时的意思，at the same time 也是重复，D没有看出什么不好的，所以选了D.

balapupu

注意,B,D that have gone virtually unregulated since they were developed more than 50 years ago 所修饰的名词是不同的，that 紧跟所修饰的名次，B修饰的是pollutants,D修饰成time了～

azhongzhong

that 不可以隔开修饰吗？能否帮我看一下这道题，好像是which 隔开修饰的，我现在搞不懂什么时候一定要紧邻所修饰对象，什么时候可以隔开？

新版prep 216.    (28818-!-item-!-188;#058&003216)    (GWD-13-1)
Although she had been known as an effective legislator first in the Texas Senate and（ later in the United States House of Representatives, not until Barbara Jordan’s participation in the hearings on the impeachment of President Richard Nixon in 1974 was she made a nationally recognized figure, as it was ）televised nationwide.
A. later in the United States House of Representatives, not until Barbara Jordan’s participation in the hearings on the impeachment of President Richard Nixon in 1974 was she made a nationally recognized figure, as it was
B. later in the United States House of Representatives, Barbara Jordan did not become a nationally recognized figure until 1974, when she participated in the hearings on the impeachment of President Richard Nixon, which were
C. later in the United States House of Representatives, it was not until 1974 that Barbara Jordan became a nationally recognized figure, with her participation in the hearings on the impeachment of President Richard Nixon, which was
D. then also later in the United States House of Representatives, not until 1974 did Barbara Jordan become a nationally recognized figure, as she participated in the hearings on the impeachment of President Richard Nixon, being
E. then also later in the United States House of Representatives, Barbara Jordan did not become a nationally recognized figure until 1974, when she participated in the hearings on the impeachment of President Richard Nixon, which was

balapupu

就是that所修饰的名次，which需要用逗号隔开，你可以看看PREP上关于that和which的使用方法和区别。

balapupu

打快了～就是That紧跟所修饰的名词

azhongzhong

楼上的，我找不到你说的PREP上关于that和which的使用方法和区别，我没有看见过：（

bitieming

LZ所给出的例子中which的跳跃修饰是核心词+修饰性介词短语的情况，是可以跳跃修饰的。
which可以跳跃修饰的情况如下：
核心词+介词、分词等修饰结构
核心词+修饰性插入语

原题D中at the same time是introduce的时间状语，不满足跳跃修饰条件

azhongzhong

楼上的这个说法我好像没有见过，你是在哪里得知的，还是自己总结的？