OG-11-105 好多语法点，值得深究，请教。。。 - ChaseDream

Originally developed for detecting air pollutants, a technique called proton-induced X-ray emission, which can quickly analyze the chemical elements in almost any substance without destroying it, is finding uses in medicine, archaeology, and criminology. 原句正确

B. originally developed for detecting air pollutants, having the ability to analyze the chemical elements in almost any substance without destroying it , a technique called proton-induced X-ray emission,

C. a technique originaly developed for detecting air pollutants, called proton-induced X-ray emission, which can quickly analyze the chemical elements in almost any substance without destroying it.

B.placement of two long modifications at the beginning of the sentences is awkward and makes it diffcult to locate the the subject;second modifier(having....) acutually modifies the first modifier.

C.called proton-induced X-ray emission should be placed next to a technique and should not be sef off by commas; relative clause introduced by which incorrectly and illogically modifies emission.

B. second modifier(having....) acutually modifies the first modifierwhy?B是不是版上牛人说的夹心结构，原来说是doing放当中，可以修饰前面的也可以修饰后面，歧义。这里，ETS明显说了修饰前面。不知道语法是什么理由。

C. called....should not be sef off by commas.why?分词也是修饰成分，为什么不能用逗号隔开的呢？原句中开头develped的修饰成分为什么就可以呢，不也是逗号隔开么？

relative clause introduced by which incorrectly and illogically modifies emission. 为什么原句中，which可以跳跃修饰technigue,这里却是修饰前面的名词emission，而不是跟前面的若干修饰成分并列修饰technigue？

B,两个分词修饰放前面，我觉得也可以说是那个恶心结构，可前可后。而且把两个分词修饰成分同时放在句首，OG里出现了几次了，应该也算典型错误了，呵呵。

C,分词用逗号隔开就变成伴随状语了，这里明显called proton-induced X-ray emission是修饰 a technique 的。

原句中which是修饰了主语的中心词a technique ，而C中，which前是一个伴随的状语修饰成分，没有中心词，那which只能修饰就近的名词。

C. a technique originaly developed for detecting air pollutants, called proton-induced X-ray emission, which can quickly analyze the chemical elements in almost any substance without destroying it.

called...可以修飾air pollutants或technique...刪

原句called....明確跟著technique較C選項佳