没有了from也不对，因为在介词+分词作状语的情况下，分词的逻辑主语是主语，就是Non-Australians ，意思全不对了。详细的，可以见og8的题干部分,不知道对你有没有帮助.请指教
GWD 21-19
Regardless of their form or function, all aerodynamically enhanced, curved objects made for throwing have been called boomerangs by non-Australians even since 1788, when Europeans saw Dharug-peaking men tossing “bumariny” in the area later known as
A. Regardless of their form or function, all aerodynamically enhanced, curved objects made for throwing have been called boomerangs by non-Australians even since 1788,
B. Regardless of their form or function, any aerodynamically enhanced, curved object made for throwing has been called a boomerang by non-Australians even since 1788,
C. Ever since 1788, non-Australians have called all aerodynamically enhanced, curved objects made for throwing boomerangs, regardless of their form or function, from
D. Ever since 1788, any aerodynamically enhanced, curved object made for throwing has been called a boomerang by non-Australians, regardless of its form or function, from (A)
E. Non-Australians have called all aerodynamically enhanced, curved objects made for throwing boomerang ever since 1788, regardless of their form or function, from
help
their指代不对吧！！！c中的their优先指代Australians
我也有这个疑问,如果c去掉from以后是否正确?
c中的regardless of their form or function,的their是否存在指代不清的歧意呢?
代词指代是不是不当作一个排除的手段阿
C. 简化一下句子，
Ever since 1788, non-Australians have called objects, from when ...
have called objects What-Name? 缺少宾补。句子结构不完整。
而且，改变了句子重心。原文主语是objects, C. 改成了Europeans.
C. Ever since 1788, non-Australians have called (all aerodynamically enhanced, curved) objects( made for throwing )boomerangs, regardless of their form or function, from
不缺宾补呀
还是想继续问 regardless of their form or function,是否会产生歧意
楼上说得对，我忽略了boomeranges, 原句不缺宾补。
regardless of thier form or function 是插入语，不明确的是their的指代。
另外，该句子改变了原文句子的重心。
GWD 21-19
Regardless of their form or function, all aerodynamically enhanced, curved objects made for throwing have been called boomerangs by non-Australians even since 1788, when Europeans saw Dharug-peaking men tossing “bumariny” in the area later known as
A. Regardless of their form or function, all aerodynamically enhanced, curved objects made for throwing have been called boomerangs by non-Australians even since 1788,
B. Regardless of their form or function, any aerodynamically enhanced, curved object made for throwing has been called a boomerang by non-Australians even since 1788,
C. Ever since 1788, non-Australians have called all aerodynamically enhanced, curved objects made for throwing boomerangs, regardless of their form or function, from
D. Ever since 1788, any aerodynamically enhanced, curved object made for throwing has been called a boomerang by non-Australians, regardless of its form or function, from (A)
E. Non-Australians have called all aerodynamically enhanced, curved objects made for throwing boomerang ever since 1788, regardless of their form or function, from
楼上说得对，我忽略了boomeranges, 原句不缺宾补。
regardless of thier form or function 是插入语，不明确的是their的指代。
另外，该句子改变了原文句子的重心。
可是A也不一定对，怎么知道句子的重心应该是什么呢？谢谢
GWD 21-19
Regardless of their form or function, all aerodynamically enhanced, curved objects made for throwing have been called boomerangs by non-Australians even since 1788, when Europeans saw Dharug-peaking men tossing “bumariny” in the area later known as Sydney.
A. Regardless of their form or function, all aerodynamically enhanced, curved objects made for throwing have been called boomerangs by non-Australians even since 1788,
B. Regardless of their form or function, any aerodynamically enhanced, curved object made for throwing has been called a boomerang by non-Australians even since 1788, 代词无直待
C. Ever since 1788, non-Australians have called all aerodynamically enhanced, curved objects made for throwing boomerangs, regardless of their form or function, from since1788位置与后面的when 离太远；代词直待不清
D. Ever since 1788, any aerodynamically enhanced, curved object made for throwing has been called a boomerang by non-Australians, regardless of its form or function, from 同C
E. Non-Australians have called all aerodynamically enhanced, curved objects made for throwing boomerang ever since 1788, regardless of their form or function, from 同C
GWD 21-19
Regardless of their form or function, all aerodynamically enhanced, curved objects made for throwing have been called boomerangs by non-Australians even since 1788, when Europeans saw Dharug-peaking men tossing “bumariny” in the area later known as Sydney.
A. Regardless of their form or function, all aerodynamically enhanced, curved objects made for throwing have been called boomerangs by non-Australians even since 1788,
B. Regardless of their form or function, any aerodynamically enhanced, curved object made for throwing has been called a boomerang by non-Australians even since 1788, 代词无直待
C. Ever since 1788, non-Australians have called all aerodynamically enhanced, curved objects made for throwing boomerangs, regardless of their form or function, from since1788位置与后面的when 离太远；代词直待不清
明了，谢！
D. Ever since 1788, any aerodynamically enhanced, curved object made for throwing has been called a boomerang by non-Australians, regardless of its form or function, from 同C
E. Non-Australians have called all aerodynamically enhanced, curved objects made for throwing boomerang ever since 1788, regardless of their form or function, from 同C
Regardless of their form or function, all aerodynamically enhanced, curved objects made for throwing have been called boomerangs by non-Australians even since 1788, when Europeans saw Dharug-peaking men tossing “bumariny” in the area later known as Sydney.
A. Regardless of their form or function, all aerodynamically enhanced, curved objects made for throwing have been called boomerangs by non-Australians even since 1788,( 正确)
B. Regardless of their form or function, any aerodynamically enhanced, curved object made for throwing has been called a boomerang by non-Australians even since 1788,(THEIR无指代)
C. Ever since 1788, non-Australians have called all aerodynamically enhanced, curved objects made for throwing boomerangs, regardless of their form or function, from(重心改变且WHEN状语修饰1788太远)
D. Ever since 1788, any aerodynamically enhanced, curved object made for throwing has been called a boomerang by non-Australians, regardless of its form or function, from (WHEN状语修饰1788太远)
E. Non-Australians have called all aerodynamically enhanced, curved objects made for throwing boomerang ever since 1788, regardless of their form or function, from(重心改变且WHEN状语修饰不好,BOOMERRAN单复数与OBJECTS不匹配)
浅见一点!
我觉得when从局是修饰1788的，所以C，D，E都没能表达这点。欢迎砸砖。
题外话：关于红色high light的逗号的用法
Regardless of their form or function, all aerodynamically enhanced, curved objects made for throwing have been called boomerangs by non-Australians even since 1788
这里逗号的用法可以么？all aerodynamically enhanced, curved objects or all aerodynamically enhanced and curved objects,这里用逗号连接两个形容词是否妥当（排除all aerodynamically enhanced是插入语的可能）
如果是平行对称结构需要三者及三者以上吧，如adj, adj, and adj+n
题外话：关于红色high light的逗号的用法
Regardless of their form or function, all aerodynamically enhanced, curved objects made for throwing have been called boomerangs by non-Australians even since 1788
这里逗号的用法可以么？all aerodynamically enhanced, curved objects or all aerodynamically enhanced and curved objects,这里用逗号连接两个形容词是否妥当（排除all aerodynamically enhanced是插入语的可能）
如果是平行对称结构需要三者及三者以上吧，如adj, adj, and adj+n
在大全里也有过这样的用法，应该是可以的，英语里没有顿号，这个逗号就相当于顿号的用法了。
to be discuss...
逗号连接并列的元素当然是可以的，我们以前的语法也是这么教的，不过就GMAT语法讲究严谨，对称的风格而言，实在吃不准啊，OG上也没有找到类似的用法。
高中语法平行对称结构最后的and都可以不加，而GMAT规定一定要加，以示平行，无歧异。而两个形容词用逗号连接很有可能使其中一个形容词短语误认为是插入结构，如果放在句首或者句尾还会误认为作状语修饰整个句子。
OPEN TO DISSCUSION...
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