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：
Salt deposits and moisture threaten to destroy the Mohenjo-Daro excavation in
Pakistan, the site of an ancient civilization that flourished at the same
time as the civilizations in the Nile Delta and the river valleys of the
Tigris and Euphrates.
(A) that flourished at the same time as the civilizations
(B) that had flourished at the same time as had the civilizations
(C) that flourished at the same time those had
(D) flourishing at the same time as those did
(E) flourishing at the same time as those were
选项分析：
(A)that flourished at the same time as the civilizations
【正确】
(B)that had flourished at the same time as had the civilizations
【错误】 动词时态：过去完成时的“had flourished”当且仅当需要强调发生在过去动作或时间之前的动作时才使用，而本句中“had
flourished”之前仅有一个一般现在时的动词“threaten”，因此此处误用过去完成时。
(C)that flourished at the same time those had
【错误1】
代词指代：“those”本应指代“civilization”，但在GMAT考察的标准书面英语中，代词只能指代句子中出现的，与之数量形式一致的名词性结构。因此复数的“those”无法指代单数的“civilization”。
【错误2】 动词时态：见(B)中动词时态。
(D)flourishing at the same time as those did
【错误】 代词指代：见(C)中【错误1】。
(E)flourishing at the same time as those were
【错误1】 代词指代：见(C)中【错误1】。
【错误2】 比较结构：即使认为“those”成功地指代了“civilizations”，“those were”也无法与“that
(civilization) flourished”形成平行可比的比较结构。
解题思路：
“those”无法指代单数的“civilization”，立即排除(C)、(D)和(E)。
(B)选项中只能在必要时表达“过去的过去”的含义的过去完成时被误用。因此只能选择(A)。
