OG12-4 官方解释的疑惑！

bennywang2usa

OG12-4
Of all the vast tides of migration that have swept 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


这道题在OG11中也出现过，但看到OG12对C的解释
?C “It is none that is more … ”is wordy; also, in this context, it must refer to something (unlike in phrases such as “it is clear that …”), yet it does not plausibly refer to anything.



这句话说it必须指代某些东西，那OG是把这个形式当强调句了呢还是当主语从句了呢？为什么要指代啊？为什么不同于it is clear that啊？

nemiah

none是代词，that应该是定语从句的引导词修饰none，不能做形式主语的的主语。