[求助]prep2-153 prep2-154 prep2-130

昨天发帖子 请教以下几个几个XDF教的绝对错误（困扰我很久！不知道这些“绝对错误”该怎么用 有时对有时错）不知为什么没人回复~~~  各位大NN帮忙回答这几个很弱弱的问题 非常非常感谢！！！

几个XDF教的绝对错误 但发现和prep 里有些题不符 请NN帮忙解疑~~ 非常感谢！！!

1.there be 啰嗦结构错（好几道题 正确答案都有there be），下面给了道prep里的题请NN帮忙解疑

2.having done, having been done必错，下面给了道prep里的题请NN帮忙解疑

3.being必错

4.prep语法笔记里说while后可接介词短语，但白勇语法里说“状语从句的省略形式：错误表达：表示转折，时间，条件的连词+介词短语/名词短语”到底哪种情况对呢？下面给了道prep里的题请NN帮忙解疑

相应prep的题

对应第一点(B)

153.
            (33147-!-item-!-188;#058&006555)

A recent United States Census Bureau report shows that there are more than three times as many households where the children and grandchildren are living in their grandparents' home as compared to households where the grandparents are living in their children's or grandchildren's home.

(A) as compared to households where the

(B) as there are households where the

(C) as those whose

(D) than compared to those where the

(E) than there are whose

对应第二点（A）

154.
            (33193-!-item-!-188;#058&006626)

Some patients who do not respond to therapies for depression may simply have received inadequate treatment, having, for example, been prescribed a drug at a dosage too low to be effective or having been taken off a drug too soon.

(A) having, for example, been prescribed a drug at a dosage too low to be effective or having been

(B) having, for example, a drug prescription that was ineffective because the dosage was too low, or being

(C) as, for example, having too low of a dosage of a prescribed drug for it to be effective, or being

(D) when they have, for example, been prescribed too low a drug dosage to be effective, or were

(E) for example, when they have a drug prescription with a dosage too low to be effective, or been

对应第四点（B）

130.
            (31416-!-item-!-188;#058&004490)

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

第4点没看明白...

前三点都不是绝对错误，而且题目中的反例也不在少数

新东方老师嘴上说的很多有扯淡成分...但是落到书上基本都挺严谨，比如白勇刘振民里面都没说being绝对错，都给出了几种情况

我觉得理解错的原因很重要,别人说是必错，那么为什么必错，一路研究下来，是不是必错和为什么必错就都明了了

there be 比较中经常有，用法主要是和前面对称，属于句子间的比较, 我的经验是there be在错误的情况下经常把句子的关系变的模糊，举个例子

Even today, a century after Pasteur developed the first vaccine, rabies almost always kills its victims unless inoculated in the earliest stages of the disease.

(A) its victims unless inoculated

(B) its victims unless they are inoculated

(C) its victims unless inoculation is done

(D) the victims unless there is an inoculation（B）

(E) the victims unless inoculated

D里面的there be 把 主语和动词的关系就给模糊化了，只知道有inoculation，到底和victims什么关系不清楚

另外刘振民书里第五页也写了there be 的四种错误，并不是必错

第二个，having been done 作状语正确不止这一个题，做定语having done,having been done我觉得应该是必错，因为having完全可以省略。

关于being,帖子很多，可以到语法区搜搜知识点的帖子,being错误的主要原因之一就是多余，比如作定语

n+being +adj,being就画蛇添足

PS 回这么个大贴确实得下挺大决心...当然回帖把知识点理一遍也特有帮助，不过你要是分四贴发肯定会有各路牛人现身的~

太谢谢啦！