OG11th -2 有关强调结构的疑问

ecochem

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 concetrated 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

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正确答案是E，我能理解

但是为什么不能把C或D看作是强调结构it is...that...结构？

OG说 'it is none that is more/it is none that was more' is a wordy and ungrammatical contruction

wordy可以理解，可为什么把强调结构说成ungrammatical contruction？

各位大大帮忙解答一下啦。

[此贴子已经被作者于2006-8-6 0:47:01编辑过]

carolhide

CD缺少逻辑主语吧，在强调句中，it只是形式主语。

sophy369

C. perhaps it is none that is more concentrated than 改为was

D. maybe it is none that was more concentrated than  maybe 是口语，错

原文不用强调，选项就不能随意增加强调结构

ecochem

谢谢sophy369的解答

我还有一个问题就是，如果原句是过去时态，那加上的强调结构后，it is... that...需要改成 it was... that...吗？