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Neuroscientists, having amassed a wealth ofknowledge over the past twenty years about the brain and its development frombirth to adulthood, are now drawing solid conclusions about howthe human brain grows and how babies acquire language. (A)Neuroscientists, having amassed a wealth of knowledge over the past twentyyears about the brain and its development from birth to adulthood, are (B) Neuroscientists, having amassed awealth of knowledge about the brain and its development from birth to adulthoodover the past twenty years, and are (C) Neuroscientists amassing a wealth ofknowledge about the brain and its development from birth to adulthood over thepast twenty years, and are (D) Neuroscientists have amassed a wealthof knowledge over the past twenty years about the brain and its developmentfrom birth to adulthood, (E) Neuroscientists have amassed, over thepast twenty years, a wealth of knowledge about the brain and its developmentfrom birth to adulthood,
我上了XDF，当时讲 SVO，doing结构其中一种情况是 doing做结果状语，doing动作发出者是整句话。
但是我刚刚看到RON 在MGMAT上的解释是这样的：
the "comma + ing" modifier should only be used when:
(A)
it MODIFIESTHE ENTIRE ACTION of the preceding clause, and it APPLIES TO THE SUBJECT ofthat clause;
AND
(B)
one of the following is true:
(1) the "ing" action is SIMULTANEOUSwith, and SUBORDINATE to, themain action;
- iran down the sidewalk, flapping my arms wildly
(2) the "ing" action is a DIRECT AND IMMEDIATECONSEQUENCE of the main action.
- igot a 100 on the most recent exam, bringing my average up to 91
所以这里的（A）（B1） 和 （A） （B2）分别是表伴随和表结果的两种情况，但是大家有没有发现在表结果处的细微差异！
中文的语法认为表结果的逻辑主语是前面整句话，没有主句主语能有适用于后面doing这一说，而Ron——it APPLIES TO THE SUBJECTof that clause; the "ing" actionis a DIRECT AND IMMEDIATECONSEQUENCE of the main action. 多了doing与主句主语适用的条件。
所以这题的 D E 选项就特别的纠结，当时我看了Elroy 的笔记
D选项now drawing在这里不能做伴随，出现了时间断层；不可能变积累知识，边归纳结论。肯定是积累了一定的知识以后归纳出来的结论在过去十年积累知识给以后作铺垫; 不能做状语（因为逻辑主语=主语全句不成立），那只能作定语，在这里可能做了adulthood的定语，不合逻辑; 此外主从交换，改变了原句强调的重心
E ：have amassed 这个动作发生在 over the past twentyyears ,are drawing 发生在now ,出现了时间断层，不可能一个是另一个的伴随；谓语是完成时态，那么既然已经完成了，drawing就无法再做其的伴随，所以只剩下做定语的功能，作adulthood的定语； 状语over the past twenty years 位置笨拙，要么提到句首去，要么像 A一样 ；
都是XDF的思路
特来求证，到底是逻辑主语是前面一整句话呢，还是 要再加上Ron的条件—— doing APPLIES TO THE SUBJECT of that clause？
个人觉得又还是没有还是有失之毫厘，差之千里的差距啊！
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发表于 2013-4-23 21:04:32
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