OG16 第6题

学习gmat的空管

of all the vast tides of migration that have swept through history, maybe none is more concentrated as the wave that brtought 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

正确答案是E
但是D为什么不可以，IT IS ...THAT作为强调句型，在这么多的迁徙中，没有一个。。。。

学习gmat的空管

哦 我知道了 时态问题~~~~