GMAT语法机经对于很多对于GMAT语法颇感无力的考生来说是个不小的助力，虽然答案都是GMAT考生网友们自己给出，但是参考价值也不小。为此楷维留学指南特意为GMAT考生们分享了2013年1月29日GMAT语法机经，文中观点来自网友仅供参考，希望对大家有所帮助。

　　1.[版本1]狗主：语法。有一题考了not only but also

　　Having won…., 人名’s work continued praised by Film Company, like 21che de….

　　[版本2]狗主：我考了很多having done，至少叁题都有having done的用法。我觉得比GWD都难，而且选项中都是不一样的，需要一个个看和排除，这个倒是当时还挺安慰，感觉答的不错，应该是难题。not so much as平行。

　　[版本3]狗主： Having done，having been done 用法 (考点：句子逻辑)

　　注解：Having done，having been done 用法

　　a，必错用法(谢谢tangzimo)：

　　having done和having been done都不是动名词结构，因此不能充当名词成分!

　　所以SC中，如果这两个结构做主语、宾语等，必错!

　　having been done做后置定语，必错!

　　having been done做后置定语，一般都要改成相应的done做过去分词，或者改成定语从句

　　having done和having been done用于“with独立主格”中必错!

　　指with+sb/sth+having done/having been done这种情况

　　b，PREP中正确的句子：

　　1.Having finally reached a tentative labor agreement with its company's pilots, the airline's board of directors must now determine how the airline can both increase profits and compete more effectively for customers than it did in the past.

　　2.Some patients who do not respond to therapies for depression may simply have received inadequate treatment, having, for example, been prescribed a drug at a dosage too low to be effective or having been taken off a drug too soon.

　　c，夸克的语法大全里面明确写出having done做限定性修饰是错误的：

　　The perfective aspect cannot usually be expressed in the nonfinite clause:

　　误:The man having won the race is my brother.

　　正:The man who has won the race is my brother.

　　也就是说.完成时的ing分词形式(having done)作为限制性的修饰是不可以的，但是可以作为非限制性的修饰。

　　参考练习：OG12th SC第21题

　　Neuroscientists, having amassed a wealth of knowledge over the past twenty years about the brain and its development from birth to adulthood, are now drawing solid conclusions about how the human brain grows and how babies acquire language.

　　A. Neuroscientists, having amassed a wealth of knowledge over the past twenty years about the brain and its development from birth to adulthood, are (正解)

　　B. Neuroscientists, having amassed a wealth of knowledge about the brain and its development from birth to adulthood over the past twenty years, and are

　　C. Neuroscientists amassing a wealth of knowledge about the brain and its development from birth to adulthood over the past twenty years, and are

　　D. Neuroscientists have amassed a wealth of knowledge over the past twenty years about the brain and its development from birth to adulthood,

　　E. Neuroscientists have amassed, over the past twenty years, a wealth of knowledge about the brain and its development from birth to adulthood,

　　A选项"having amassed a wealth of knowledge over the past twenty years about the brain and its development from birth to adulthood"，你可以把这个成分理解成状语，也可以理解为定语，修饰的都是Neuroscientists这个主体或这个主体发出的动作，只要你把having看做定语和状语时，句意理解起来是一样的，那么就没有歧义问题。

　　2.狗主残狗：语法第一道上来就是说什么什么---(破折号，开始划线)most什么什么in 1070什么什么Kyoto, Japan什么什么啊啊啊记不得了，然后还有破折号!等我再想想。

　　3.我记得有一个考了unlike的用法，不过unlike是放在句中的，前面有个when-clause~

　　注意：unlike/like前后连接的结构要对称平行，可接抽象和具体名词。

　　4.[版本1]狗主：

　　Over..miles..in..B某地方... there lives SSS people who.....

　　选项有 live, lives, there live, had live...还有忘了...

　　有考到两次both, 不难, 选项很容易分辨both裡外是否parallel

　　解析：题目很明显考到了时态的问题。

　　[版本2] 狗主：Over 某地, live the N people that are known as the most isolated people in modern world.

　　选项有have lived, lives……这个我应该没错吧……遇到这么简单的题也可以看出楼主的语法有多挫了

　　[版本3] 狗主：SC有那道机经上的over eighteen 啥啥啥(是一个地方) there lives 啥啥啥(一个什么东西)，我觉得这是个倒装吧，就是一个什么东西live在一个什么地方，所以我选的和狗主的一样live。

　　5.狗主：1.考了which从句的用法，考了同位语。。。(啊啊啊!!好笼统。。。对不起人民群众啊)

　　Which从句的用法

　　①which引导非限定性定语从句，前面必须加逗号

　　②要绝对挨着要修饰的名词，不能指代前面整个句子

　　6.[版本1]狗主：遇到一题与prep塬题类似的

　　前半句划线