GMAT句子改错题(sentence correction)，是整个GMAT考试中对考生英语语法能力考查要求最高的题型，也往往是中国学生最为头疼的一类题目。没有扎实的语法基础和一定的逻辑分析能力，想要做好句子改错题难度极高。如何提升GMAT句子改错题的解题能力?下面小编就为大家整理了一些经典例题，结合实例分析为大家讲解GMAT句子改错题的解题思路和方法技巧。
实例题目：
While it costs about the same to run nuclear plants as other types of power plants, it is the fixed costs that stem from building nuclear plants that makes it more expensive for them to generate electricity.
(A) While it costs about the same to run nuclear plants as other types of power plants, it is the fixed costs that stem from building nuclear plants that makes it more expensive for them to generate electricity.
(B) While the cost of running nuclear plants is about the same as for other types of power plants, the fixed costs that stem from building nuclear plants make the electricity they generate more expensive.
(C) Even though it costs about the same to run nuclear plants as for other types of power plants, it is the fixed costs that stem from building nuclear plants that makes the electricity they generate more expensive.
(D) It costs about the same to run nuclear plants as for other types of power plants, whereas the electricity they generate is more expensive, stemming from the fixed costs of building nuclear plants.
(E) The cost of running nuclear plants is about the same as other types of power plants, but the electricity they generate is made more expensive because of the fixed costs stemming from building nuclear plants.
选项分析：
(A)While it costs about the same to run nuclear plants as other types of power plants, it is the fixed costs that stem from building nuclear plants that makes it more expensive for them to generate electricity.
【错误】 主谓一致：强调句“it is the fixed costs that stem from building nuclear plants that makes……”去掉强调结构“it is……that……”并还原成正常语序后为“the fixed costs makes……”主谓不一致。
(B)While the cost of running nuclear plants is about the same as for other types of power plants, the fixed costs that stem from building nuclear plants make the electricity they generate more expensive.
【正确】 定语从句“that stem from building nuclear plants”正确地修饰了名词“costs”。“the fixed costs”是“make”的主语，满足主谓一致。
【大意】 虽然运行核电厂的成本和运行其他种类电厂的成本大体相同，构建核电站的固定成本使得他们发的电更贵。
(C)Even though it costs about the same to run nuclear plants as for other types of power plants, it is the fixed costs that stem from building nuclear plants that makes the electricity they generate more expensive.
【错误】 主谓一致：见(A)。
(D)It costs about the same to run nuclear plants as for other types of power plants, whereas the electricity they generate is more expensive, stemming from the fixed costs of building nuclear plants.
【错误】 修饰成分：逗号加“stemming from the fixed costs of building nuclear plants”放在主谓结构的结尾本应作“伴随状语”或“结果状语”，但语义上，这个修饰语无法修饰任何对象。
(E)The cost of running nuclear plants is about the same as other types of power plants, but the electricity they generate is made more expensive because of the fixed costs stemming from building nuclear plants.
【错误】 比较结构：“The cost of running nuclear plants”与“other types of power plants”之间并不可比，应当将后者改为“that of other types of power plants”等才能形成平行可比的比较结构。
解题思路：
强调句式还原后发现主谓不一致，立即排除(A)、(C)。
(E)中比较对象不可比，立即排除。
(D)中修饰关系不合理，排除。因此选择(B)。
