| 这是综合og13 语法部分的25题 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. a,) Neuroscientists, having amassed a wealth of knowledge over the past twenty years about the brain and its development from birth to adulthood, are b) Neuroscientists, having amassed a wealth of knowledge about the brain and its development from birth to adulthood over the past twenty years, and are c) Neuroscientists, amassing a wealth of knowledge about the brain and its development from birth to adulthood over the past twenty years, and are d) Neuroscientists have amassed a wealth of knowledge over the past twenty years about the brain and its development from birth to adulthood e) Neuroscientists have amassed, over the past twenty years, a wealth of knowledge about the brain and its development from birth to adulthood, 答案：A 比较疑惑的地方在于：题目中的its 指代的不应该是 a wealth of knowledge 吗？？那这样来说的话， 原句是不对的呀， 就应该将原句改为由 a wealth of knowledge 做its的主语呀。我自己的答案选的是e。 不知道e为什么错了？og上的解释也看了 但是解决不了我的问题呀~~还有一个问题 ，就是have 什么时候要加-ing 呢, 这里的having amassed 这样的形式结构表明了什么意思呢？？跟have amassed 有什么区别呀？？？还请各位牛牛们帮忙看一下~~~·！！万分感谢呀！！！！ |
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