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标题: og verbal sc 14，求大神帮忙分析一下句型结构！Since的用法【已解决】 [打印本页]

作者: iamluluhaha 时间: 2016-11-24 13:09
标题: og verbal sc 14，求大神帮忙分析一下句型结构！Since的用法【已解决】
A March 2000 Census Bureau survey showed that Mexico accounted for more than a quarter of all foreign-born residents of the United States, the largest share for any country to contribute since 1890, when about 30 percent of the country’s foreign-born population was from Germany.
A. the largest share for any country to contribute
B. the largest share that any country has contributed
C. which makes it the largest share for any country to contribute
D. having the largest share to be contributed by any country
E. having the largest share to have been contributed by any country

答案B，我选了D，我后来一想，也觉得自己选的不对，但我真的不知道为什么选B，还有为什么A可以排除？

求哪位nn可以帮忙分析一下句子结构啊？
这个划线部分一直到since 1890在这里做的什么成份？
我只知道它是modifier，modifies Mexico，但这个同位语吗？还是什么独立主格，如果可以帮忙讲解一下同位语和独立主格就更好了！

先在此谢过了！

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在Manhattan找到了Ron的讲解，给以后对此同样有迷糊的小伙伴助助力吧！

if you're looking at
Since xxxx, yyyy
or
Yyyy since xxx

then...

'yyyy' should be....
...'has/have __ed' if its timeframe is 'up to the present'
or
...'had __ed' if its timeframe is 'up to some past point' (= NOT 'up to the present')

'xxxx' is normally a date or a past-tense construction

所以基本来说就是，看到since，如果划线部分是考察时态，判断，这件事情是否延续到现在，是---- has／have + v. ed; 否---- had + v.ed

Refernence：https://www.manhattanprep.com/gmat/forums/doubtful-sc-a-march-2000-census-bureau-survey-showed-t8489-15.html

作者: lfzlxm 时间: 2016-11-25 01:26
看到since，根据句义显然用完成时，所以我就选了B了= =。。。
弄清楚一个修饰语究竟是什么成分感觉比较像是高中的做题方法，GMAT基本上不靠这个的= =所以我也不太会，这个帮不了你了，抱歉

作者: iamluluhaha 时间: 2016-11-25 02:41

lfzlxm 发表于 2016-11-24 09:26
看到since，根据句义显然用完成时，所以我就选了B了= =。。。
弄清楚一个修饰语究竟是什么成分感觉比较像是 ...

嗯嗯，还是谢谢了～

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