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Obtaining an investment-grade rating willkeep the county's future borrowing costs low, protect its already-tattered image, and increase itsability to buy bond insurance. (A) Obtaining an investment-grade rating willkeep the county's future borrowing costs low, protect (B) To obtain an investment-grade rating willkeep the county's future borrowing costs low, and protect (C) Having obtained an investment-graderating will, in keeping the county's future borrowing costs low, protect (D) To obtain an investment-grade ratingwould 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
这里的Obtaining，to obtain做主语，但是我记得PREP08中不是说分词短语不能做主语么？所以这里的不定式和分词短语做主语都是对的么？
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发表于 2013-10-1 09:05:18
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