when和in which

smileyleung

OG13 SC 35 中解释说time后面要用when, 我以为修饰时间名词的定语从句when和in which不能互换.

35. By 1940, the pilot Jacqueline Cochran held seventeen official national and international speed records, and she earned them at a time when aviation was still so new for many of the planes she flew to be of dangerously experimental design.

(A) and she earned them at a time when aviation was still so new for many of the planes she flew to be

(B) earning them at a time that aviation was still so new for many of the planes she flew to be

(C) earning these at a time where aviation was still so new that many of the planes she flew were

(D) earned at a time in which aviation was still so new such that many of the planes she flew were

(E) earned at a time when aviation was still so new that many of the planes she flew were

谁知道OG13 SC 72 修饰age的时候OG又说in which和when可以互换. 到底是怎样嘛~~~~ (抓狂

72. His studies of ice-polished rocks in his Alpinehomeland, far outside the range of present-day glaciers, led Louis Agassiz in1837 to propose the concept of an age in which great ice sheets hadexisted in now currently temperate areas.

(A) in which great ice sheets had existed in nowcurrently temperate areas

(B) in which great ice sheets existed in what are nowtemperate areas

(C) when great ice sheets existed where there wereareas now temperate

(D) when great ice sheets had existed in currenttemperate areas

(E) when great ice sheets existed in areas now thatare temperate

Niuniuwjy

我也分不清when和in which的差别，但是这两道题目，抛开这个考点，也是可以解决的呀。

qixiaiqixi

smileyleung 发表于 2014-10-5 20:24
别沉啊~~~~我想知道解释啊~~~~~~~~~~~~~

我来说说我的看法哈~
当所指代时间是一个时间段时，in which 和 when可以互换,
当所指代时间是一个时间点或确定时间时，只能用when不能用in which
在35题中， 我们从at 可以看出time是个时间点，因为at后面加明确时间，这里的time明确指代这个人获得records的时间，所以只能用when
在72题中age是一个时间段，泛指ice sheets 存在的那段时间，这是一个时间区间，而不是时间点，所以可以用互换
另外，关于in which为什么只能指代时间段，我认为因为他更贴近during的意思
最后，我所有的理解大部分从这个帖子中获得：http://www.beatthegmat.com/og13-sc-q35-vs-q72-t265826.html

smileyleung

别沉啊~~~~我想知道解释啊~~~~~~~~~~~~~

smileyleung

35答案是E, 72答案是B