His studies of ice-polished rocks in his Alpine homeland, far outside the range of present-day glaciers, led Louis Agassiz in 1837 to propose the concept of an age when great ice sheets had existed in current temperate areas.
语法 Sentence Correction-349
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正确的用户笔记
tian4690 2016-03-21 12:00:45
"When and in which" both are used to modify a time period but here the period is already defined by the word "age". "age in which" is correct and not "age when"
Cynth1aC 2015-12-19 17:03:25
大家都是因为时态排除了D ！！！生气！！！有没有别的排除方法！！！
不考到730誓不罢休的小星星 2016-09-05 14:53:49
逻辑错误，句意是说great ice sheets 曾经存在于一些地方（什么样的地方呢？ 是现在变成气候温和的地方） 这句说great ice sheet 曾经存在于现在的气候温和的地方，逻辑错误，以前的冰块怎么会存在在现在的地方？
勋达令 2017-01-07 15:05:43
不能用had应去掉
umasou999 2016-12-27 06:25:24
1、时态 2、逻辑：自带逻辑的词current temperate areas – （现在的，最近的）改变含义，应该为currently temperate areas（adv.=now 当前，目前）
糯米团子QUQ 2016-10-31 22:10:45
if the sentence makes sense in both past and past perfect tense, we should usually go with the past tense rather than the past perfect.
SophiaLi 2016-10-08 21:53:39
the emphasis of the sentence is on the fact that the ice sheets ACTUALLY EXISTED during this time. the sentence is not meant to emphasize the persistence of the ice sheets before that age, nor is it meant to suggest that the existence of the ice sheets was a completed action. therefore, the regular past tense is better.
SophiaLi 2016-10-08 21:53:38
the emphasis of the sentence is on the fact that the ice sheets ACTUALLY EXISTED during this time. the sentence is not meant to emphasize the persistence of the ice sheets before that age, nor is it meant to suggest that the existence of the ice sheets was a completed action. therefore, the regular past tense is better.
sunnycc225 2016-07-16 03:50:07
concept跟的从句的时态，因为是陈述事实，那就不要考虑过去完成时啊。
胖哒鱼 2016-07-01 09:28:16
1.When and in which" both are used to modify a time period but here the period is already defined by the word "age". "age in which" is correct and not "age when 2.时态错误
liaoly 2016-06-20 06:59:11
have existed不对
sujingyi5 2016-05-16 10:08:26
Led 和exist没有必然联系，不需完成时 Currently temperate
