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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.
A
Obtaining an investment-grade rating will keep the county's future borrowing costs low, protect
B
To obtain an investment-grade rating will keep the county's future borrowing costs low, and protect
C
Having obtained an investment-grade rating will, in keeping the county's future borrowing costs low, protect
D
To obtain an investment-grade rating would keep the county's future borrowing costs low, protecting
E
Obtaining an investment-grade rating, keeping the county's borrowing costs low, would be protecting
【申友解析】
正确答案：A
考点：平行
谓语动词 keep，protect和increase平行；在最后一个名词前面加上and即可
A 正确
B protect前面的and多余
C in keep和protect，increase不能平行
D protecting和keep，increase不平行
E keeping would be protecting和increase不平行
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