脑子有点浆糊，请教E中，
an era during which的during前面为什么不加逗号？记得非限定性定语从句要加逗号的。
Tom Bradley was mayor of Los Angeles from 1973 to 1993, an era when the city had transformed from a collection of suburban neighborhoods to the second-largest city in the United States.
(A) an era when the city had transformed
(B) an era during which the city was transformed
(C) an era that transformed it
(D) during which era the city transformed
(E) during which the city was transformed
A 为什么错？
B的被动语态应该由什么引起呢？
from －－to－－用一般过去时吧；
人民，只有人民才是历史的创造者。
觉的虽然B也不是很好an era 和during which有些罗嗦。但是和E比起来（whice指代有问题）。B要好些
Tom Bradley was mayor of Los Angeles from 1973 to 1993, an era when the city had transformed from a collection of suburban neighborhoods to the second-largest city in the United States.
(A) an era when the city had transformed
(B) an era during which the city was transformed
(C) an era that transformed it
(D) during which era the city transformed
(E) during which the city was transformed
A 为什么错？
B的被动语态应该由什么引起呢？
A 为什么错？
——city被transform要比transform好些，特别是这里强调的是市长的事情，不是CITY自身
——下次再看见from 1973 to 1993，一定要优先选一般过去时，而不是完成时
一段时期能用when代替么？
我觉得B特别好：an era是必须拿出来指代前面的from to时间段的during which再用来修饰这个词才可以
look at OG SC 2 as an example:
2. Since 1981, when the farm depression began, the number of acres overseen by professional
farm-management companies have grown from 48 million to nearly 59 million, an area that is about
Colorado's size.
(A) have grown from 48 million to nearly 59 million, an area that is about Colorado's size
(B) have grown from 48 million to nearly 59 million, about the size of Colorado
(C) has grown from 48 million to nearly 59 million, an area about the size of Colorado
(D) has grown from 48 million up to nearly 59 million, an area about the size of Colorado's (C)
(E) has grown from 48 million up to nearly 59 million, about Colorado's size
Answer to Question
2In choice C, the best answer,
an area about the size of Colorado clearly describes a rough equivalence between the area of Colorado and the area overseen by the companies.Here an era describes the period from 1973 to 1993.
So B is best answer.
其實也可以從時態來看
Tom Bradley was mayor of Los Angeles from 1973 to 1993,an era during which the city was transformed
an era 跟from 1973 to 1993是同一段時間 所以在Tom Bradley was mayor of Los Angeles from 1973 to 1993 是用過去簡單式 那麼an era必定也要一致用過去簡單式
我选E B不够简洁
有例为证：http://www.kpl.org/ayl_history_kpl.shtml
Mr. Lynn Matthews served as Chief Librarian from 1973 to 1993, during which time extensive development of all library services and resources took place. Additional library branches opened in Forest Heights (1976) and Pioneer Park (1982). In 1978, an extension was added to the Main Library building and shortly thereafter, the Library introduced its first automated computer catalogue system. KPL marked its 100th anniversary celebrations in 1984 with the opening of the Grace Schmidt Room of Local History.
知道拉
谢谢
A不对是因为城市自己不能改革要被人改革,所以用被动.要在had后面加一个been.这是第一个错,第二是不能用when,要用which/that,why?
这就是B和E的区别拉.
B.an era during which the city was transformed
E. during which the city was transformed
我们都知道划线部分是一个定语从句.主语是人,谓语是改革.宾语是城市.句子的主谓宾结构都是健全的,所以我们在选择引导词的时候要用关系副词,when,where,why之类的.而during which或者说"一个介词+which作用相当于连接副词,在句子中做状语".所以选B.
which/that/as都是关系代词,在句子中做主语和宾语.
这里的时态应该选B在过去的某个时间段要用过去时态而不是过去完成时态。
C错在that修饰Era 时间不能改变城市而是城市在这个时间段内改变。
脑子有点浆糊，请教E中，
an era during which的during前面为什么不加逗号？记得非限定性定语从句要加逗号的。
脑子有点浆糊，请教E中，
an era during which的during前面为什么不加逗号？记得非限定性定语从句要加逗号的。
不是有逗号的阿,E不对是因为which指代不明,
which只能指代文中出现的名词,而from 1973 to 1993是名词???
所以只能指代1973 或1993,这两个都是混淆的,而且指代哪个都是改变句子的意思的.
还是阿?
嘻嘻，这里是an era是同位语从句啦，优于(E)中的非限定从，因为(E)中的which可以指代1993，离它最近的名词，就变成during 1993了
up
突然悟出E错哪了 可以指在那俩年份之间 也可以只在那后面一年之间！
an era 和 during which 不是重复，这是为了避免歧义而在定从前补出修饰名词的做法，OG里面有类似的例子和解释，大家可以看一下。
E 改成 during a period the city was transformed... 还是错的，这样成了 run-on sentence.
D 的错误主要出在被动。但个人觉得 an era during which 要比 during which era 好。前面一个是 OG 惯用的表达，后面一个印象中没出现过。虽然网上有类似句子，不知道 ETS 对此态度如何，请路过的NN帮忙判定一下好了。 
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