OG语法题求助，牛牛请进

JoeyLareina

OG十二版第107题：｛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.
(A) 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,
(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 originally 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,
(D) A technique originally developed for detecting air pollutants, called proton-induced x-ray emission, which has the ability to analyze the chemical elements in almost any substance quickly and without destroying it,
(E) A technique that was originally developed for detecting air pollutants and has the ability to analyze the chemical elements in almost any substance quickly and without destroying the substance, called proton-induced x-ray emission,
OG答案是A，C和D错误的原因都是which错误指代了emission，但A中which为什么又不是指代emission呢？哪位牛牛能帮我解答一下？ which的指代问题。。。

用户名已经存在

C和D错误的原因主要在 called proton-induced x-ray emission 没有直接跟在a technique 后面

JoeyLareina

谢谢！OG的答案中指出C、D中的which错误地修饰了emissions，A的which修饰了a technique，我的意思是问：A的which和C、D的which为什么修饰不同？

luul65

2楼同问，求NN解答！

luul65

http://forum.chasedream.com/GMAT_SC/thread-459346-1-1.html这个帖子有讲解