GMAT语法改错的难度一方面来自题干，另一方面来自选项，因为我们要依靠选项之间的差别来获得信息、寻求提示，其实这就反映了GMAT语法改错答案的特点--永远只有相对正确而不存在绝对正确。接下来小编就给大家介绍一下GMAT语法题，希望对大家备考GMAT语法考试有帮助。
89. 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
答案解析如下：
(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。
【最优解题思路推荐】
“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)。
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