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dash在此处代表后面的整句话都是描述解释前半句,根据见到的题,dash后面可以跟完整的也可以跟词组(这道题)
在此解释一下A:at some time in the past our ancestors suffered an event, reducing their numbers and thus our genetic variation.
因为reducing后的动作需要和主句一个时间,immediately result, 且后面and是一个小并列,那么可以拆开来看:
sb. suffered an event, reducing their numbers
sb. suffered an event, thus reducing our genetic variation.
因为thus reducing明显不是一个时间,所以A的逻辑不对。
在og中还有道题:
OG18-720:
A: neuroscientists, having amassed a wealth of knowledge over the past twenty years about the brain and its development from birth to adulthood, are now drawing solid conclusions about how the human brain grows and how babies acquire language.
E: Neuroscientists have massed, over the past twenty years, a wealth of knowledge about the brain and its developmennt from birth to adulthood, now drawing solid conclusions about how the human brain grows and how babies acquire language.
同thus doing modifier 一样,这道题的E是用now doing modifier,时间上逻辑有误!正确答案A
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