原题是这样的：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 that three decades. 正确答案是E：perhaps none was more concentrated than 求问 为什么用was 原题为什么不能看做客观事实用is
OG解释如下，the second part of the sentence uses the past tense verb brought, indicating that the event is over. The verb used in the comparative construction must also be past tense, x (none) was more concentrated than y (the wave).
我个人的理解，x is more concentrated than y 需要逻辑上平行，文中y的部分 the wave that brought表明y发生在过去，这样x的比较部分也要用过去
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发表于 2011-9-16 13:46:27
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