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 对于obtaining 和to obtain OG的解释是 the infinitive subject to obtain suggests that obtaining an investment grade rating is an objective in and of itself, not a means to achieve the desired benefits.这个解释我不是很清楚 有NN解释一下to obtain 和obtaining 的区别的吗? 谢谢
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