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我举一个OG2017的例题(好像书上也有。。)(OG2017 719题 A和E两个选项):
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 have amassed, over the past twenty years, a wealth of knowledge about the brain and its development from birth to adulthood,
选项(A)中主句谓语动词是 are now drawing(正在进行时),分词短语是having amassed ;选项(B)中两者颠倒了,主语谓语动词是 have amassed,分词短语是drawing。利用刚才的原则,(A)没问题,因为积攒知识肯定先发生,我可以认为,神经科学家在下结论的每时每刻都具有积攒了20年的知识的这个状态。(B)不对,因为,不可能在神经科学家积攒20年的知识的每时每刻,都下结论。肯定是先攒好了知识,再下结论。
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