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GWD-21-Q19
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,
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
E.
Non-Australians have called all aerodynamically enhanced, curved objects made for throwing boomerang ever since 1788, regardless of their form or function, from
这道题目给出的答案是A ,请帮我解释下. B their和后面的object不符合 C 是什么错误啊， 难道说their 指代有问题？？？？？ D 我也不时很清楚。。。 E 是boomerang 的复数问题。 请niuniu帮我解释下C，D吧，谢谢了 | 
