求解释！OG13 SC5 of 在句首的用法

tyd727

OG13 SC5
Of all the vast tides of migration that have swept through history, maybe none is more concentrated as the wave that brought 12 million immigrants onto American shores in little more than three decades.
(A) maybe none is more concentrated as
(B) it may be that none is more concentrated as
(C) perhaps it is none that is more concentrated than
(D) maybe it is none that was more concentrated than
(E) perhaps none was more concentrated than

Of all the vast tides of migration that have swept through history.....
这里的of 怎么理解，在...中吗？
of放在句首是什么用法？
SC菜鸟啊....请大家帮忙解释一下

tyd727

大家帮忙解释一下呗~~~~~

tyd727

大家帮忙解释一下呗~~~~~

女娲丁丁丁

个人感觉应该是 perhaps none of all the vast tides of migration that have swept through history was more..... 在历史上所有大规模的的移民潮中，没有一个...