Obtaining an investment-grade rating will keep the county's future borrowing costs low, protect its already-tattered image, and increase its ability to buy bond insurance.


Obtaining an investment-grade rating will keep the county's future borrowing costs low, protect

To obtain an investment-grade rating will keep the county's future borrowing costs low, and protect

Having obtained an investment-grade rating will, in keeping the county's future borrowing costs low, protect

To obtain an investment-grade rating would keep the county's future borrowing costs low, protecting

Obtaining an investment-grade rating, keeping the county's borrowing costs low, would be protecting

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题目分析：
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选项分析：

A选项：Correct. 本选项在语法和逻辑上均是正确的。

B选项：不定式短语to obtain an investment-grade rating需改为ing短语obtaining an investment-grade rating，这点考查了不定式和ing的区别。用之于本题，显然地，说出“获得投资等级分数将会帮助国家做很多事”的说话者通常不会自己做“获得投资等级分数”这件事，而是从客观的角度讨论“获得投资等级分数”的意义。
另外，“保持未来国家借款成本低”，“保护国家本已破败的形象”，和“增加购买保险的能力”应是并列的三件事，在连接并列的三者时，只能用A，B，and C，不能用A，and B，and C。

C选项：在逻辑上，“保持未来国家借款成本低”，“保护国家本已破败的形象”，和“增加购买保险的能力”应是并列的三件事，应用and连接三者已保持对等，不能让keeping做另外两者的修饰。

D选项：不定式短语to obtain an investment-grade rating需改为ing短语obtaining an investment-grade rating错误同选项(B)；三个事件不平行在原理上错误同选项(C)。

E选项：三个事件不平行在原理上错误同选项(C)。

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Prep2007E1-SC
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