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OG12 131 关于while的用法有点困惑..请各位不吝赐教

Over 75 percent of the energy produced in France derives from nuclear power, while in Germany it is just over 33 percent.

A. while in Germany it is just over 33 percent
B. compared to Germany, which uses just over 33 percent
C. whereas nuclear power accounts for just over 33 percent of the energy produced in Germany
D whereas just over 33 percent of the energy comes from nuclear power in Germany
E compared with the energy from nuclear power in Germany, where it is just over 33 percent

答案选C是没有问题来着。
但是OG对A的解释A选项的解释“Whileis somewhat ambiguous,since it might indicate simultaneity rather than contrast......“有点让我困惑...为什么while indicate simultaneity rather than contrast?  在GMAT里while一般都不用作表转折吗?
看了以前的帖解释说是因为while可能会有歧义...但是单词只要多于一个意思就会导致有歧义在G里就不能用了吗?这有点奇怪诶....
求解答,谢谢
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Sometimes "while" can be explained as "simultaneity", for example, I am doing my homework while she  ...
panbangzhu 发表于 2012-3-13 20:14


嗯...我能明白A里it的指代不明导致这句话错了...我不明白的是为什么OG里的解释中又说while can be explained as simultaneity rather than contrast....

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