GMAT考试中语法改错SC题型让考生比较头疼的一点在于考试本身覆盖的语法点太多，大家别考时间不够就很有可能出现遗漏或者来不及准备的情况。有鉴于此小编建议大家从高频热门语法点开始优先准备起来。下面小编就来讲解not only … but also的用法。
GMAT语法大百科语法点： not only … but also的用法说明
1.在正常语序中: not only … but also 应连接两个相对称的并列成分。例如：
Not only Mr Lin but also his son joined the Party two years ago. (连接两个主语)
在正常语序中: 短语本身不可以加入其它成份，比如变成：not only...but it also...是错误的(因为破坏了平衡)。
2. not only … but also 连接两个主语时，谓语动词要和与其最近的主语保持人称和数的一致。
3. not only … but also 不能用在否定句中。例如：
误： They don't fear not only hardship but also death.
正： They fear neither hardship nor death.
正： They don't fear either hardship or death.
4. not only … but also 连接两个分句，并且 not only 位于句首时，第一个分句中的主语和谓语要部分倒装。
GMAT高频not only … but also用法实例讲解
In 1978 a national study found that not only had many contractors licensed by a self-policing private guild failed to pass qualifying exams, they in addition falsified their references.
(A) they in addition falsified their references
(B) they had their references falsified in addition
(C) but they had also falsified their references
(D) they had also falsified their references
(E) but their references were falsified as well
选项分析：
一看题目，就知道考的语法点是not only，but aiso，前半句话已经倒装，后半句话应该是正常语序。之所以前后都加入主语，不是为了连接主语，而是为了句子的对仗工整而补足主语，连接的其实是主语的两个不同的谓语动作。
所以最后答案是C
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