19. GWD17-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-speaking men tossing “bumariny” in the area later known as Sydney.
- Regardless of their form or function, all aerodynamically enhanced, curved objects made for throwing have been called boomerangs by non-Australians ever since 1788,
- Regardless of their form or function, any aerodynamically enhanced, curved object made for throwing has been called a boomerang by non-Australians ever since 1788,
- Ever since 1788, non-Australians have called all aerodynamically enhanced, curved objects made for throwing boomerangs, regardless of their form or function, from
- 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
- Non-Australians have called all aerodynamically enhanced, curved objects made for throwing boomerangs ever since 1788, regardless of their form or function, from
答案是E，我选的是A，后来觉得E中虽然主动替换了原句的被动是正确的，但是仍然无法理解最后那个介词,from，请教各位NN解答一下when的前面为什么要加from？ | 
