so怎样快速识别出这个考点？考试中会考到定语从句中的哪些点？所以真的真的真的没有那么简单哦。比如下面这个题：

01

According to Box, a leading Greenland expert, tundra fires in 2012 from as far away as North America produced great amounts of soot, some of it drifted over Greenland in giant plumes of smoke and then fell as particles onto the ice sheet. (OG-1)

A) NO CHANGE

B) soot

C) of which

D) DELETE the underlined portion.

没有题干，选项的提示作用也有限，如果句子结构看不清楚，真是没法做

还有这个题：

02

Planned obsolescence, a practice at which products are designed to have a limited period of usefulness, has been a cornerstone of manufacturing strategy for the past 80 years. (OG-2)

A) NO CHANGE

B) from which

C) so that

D) whereby

虽然能判断出来是定语从句，可是那个which前面的介词怎么用啊？

再来看看下面这个题：

03

Named for the bookseller, who found it in an Italian monastery in 1912, the manuscript is widely believed to have been written in the fifteenth century. (1811北美) 

A) NO CHANGE

B) bookseller;who

C) bookseller-who

D) bookseller who

用who就用who吧，怎么还有标点呢，定语从句跟标点符号有什么关系呢？

那这个题又是什么情况：

04

Traditionally, these documents have been printed on vellum, a long-lasting calfskinparchment. This calfskin vellum is now expensive and difficult to obtain.(1812亚太)

Which choice most effectively combines the sentences at the underlined portion?

A) parchment, it being the case that now vellum is

B) parchment, and it is this material that is

C) parchment that is now

D) parchment so

终于有题干了，可是C除了比B短一点，还有什么区别么？

如果你也有这些困惑，如果你正在或将要备战SAT，欢迎收听本周的SAT公开讲座，Mandy老师会帮你搞定这些问题，轻松解决定语从句。