Ofall the vast tides of migration that have swept through history, maybe noneis more concentrated as the wave that brought12 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 moreconcentrated as
(C) perhaps it isnone that is moreconcentrated than
(D) maybe it is none that wasmore concentrated than
(E) perhapsnone was more concentrated than
答案是E没问题,我想问的是,CD中的IT没有指代是不是因为他是强调句呢。。。。。。。OG的原话是:in this context, it must refer to something(unlike in phrases such as "it is clear that",yet it does not refer to anything
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