having的用法啊！！！肿么用肿么用 OG12 24

yuyang0206 · 发表于 2011-4-18 16:12:33

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正选就是A，其他的就不放了。。。
迷惑的是having done...，我看prep解释说having done不能用作修饰，那这里的having amassed 不是很奇怪吗？
所以having 到底应该怎么用蛤？求解释

lonelyorchid · 发表于 2011-4-18 17:55:05

are now drawing solid conclusions。这个是一个现在的时间点，表明科学家已经获得了证据，说明，他们的amass是在过去完成的，所以要用完成时。。。

having的用法啊！！！肿么用肿么用 OG12 24

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