GMAT语法的一大考点就是平行结构，所以想要语法得到高分，平行结构必须要弄清楚。平行结构也是GMAT语法的专属考点，本文就给大家带来GMAT语法平行并列真题解析，希望对大家有帮助。由于篇幅较多，我们分开几部分给大家讲解。首先讲解第一部分。
例1：
In late 1997, the chambers inside the pyramid of the Pharaoh Menkaure at Giza were closed to visitors for cleaning and repair due to moisture exhaled by tourists, which raised its humidity to such levels so that salt from the stone was crystallizing and fungus was growing on the walls.
A due to moisture exhaled by tourists, which raised its humidity to such levels so that salt from the stone was crystallizing
B due to moisture that tourists had exhaled, thereby raising its humidity to such levels that salt from the stone would crystallize
C because tourists were exhaling moisture, which had raised the humidity within them to levels such that salt from the stone would crystallize
D because of moisture that was exhaled by tourists raising the humidity within them to levels so high as to make the salt from the stone crystallize
E because moisture exhaled by tourists had raised the humidity within them to such levels that salt from the stone was crystallizing
分析：
the chambers是句子主语，inside the pyramid of the Pharaoh Menkaure at Giza介词短语做的定语，were closed是谓语，to visitors for cleaning and repair介词短语，due to moisture exhaled by tourists, which raised its humidity 这里出现了代词its,见到代词看指代，指代通常不合理，那么我们看一下its的指代到底合不合理。这句话的意思是增加了它的湿度，既然增加了湿度，那就是某个地方(someplace)的湿度，这里唯一的someplace就是句子的主语 chambers，如果是这样的话，句子的主语是可数名词的复数，显然its的使用就不是正确的。紧接着我们找一下这个句子的平行并列的提示词，我们发现句子后面出现了and ，and 后面是一个完整的句子， fungus was growing，而且这个并列句子是个过去进行时态，所以and前面也应该是一个完整的句子，时态最好也是过去进行时态。我们看一下五个选项。首先AB选项its使用代词指代不一致，排除。先看比较简单的D选项，because of moisture that was exhaled by tourists其中that引导的是定语从句，修饰moisture，说的是游客呼出的水分。raising the humidity 这里是doing结构，我们知道doing结构前面没有逗号的话，修饰的也是就近名词 tourists ，但是根据句意是游客呼出的水分增加了湿度而不是游客增加的湿度，所以这里的doing修饰不对，排除。剩下C和E.因为and后面的并列成分是过去进行时态，所以经过对比，C选项 stone would crystallize 使用的过去时态，不太合理。另外 tourists were exhaling moisture,这里用的是过去进行时态，因为后面未划线部分用的是过去进行时态，但是前面这句话没有用过去时态的提示词，所以是错误的。所以正确答案就是E.
正确句子:
In late 1997, the chambers inside the pyramid of the Pharaoh Menkaure at Giza were closed to visitors for cleaning and repair because moisture exhaled by tourists had raised the humidity within them to such levels that salt from the stone was crystallizing and fungus was growing on the walls.
验证：
the chambers是句子主语，inside the pyramid of the Pharaoh Menkaure at Giza介词短语做的定语，were closed是谓语，because引导原因状语从句，从句主语是moisture ，exhaled by tourists 是动词的ed分词作定语，had raised 是谓语，such …… that 引导结果状语，that后面是两个句子，平行比例而且都用的是过去进行时。
例2：
There are several ways to build solid walls using just mud or clay, but the most extensively used method has been the forming of bricks out of mud or clay, and, after some preliminary air drying or sun drying, they are laid in the wall in mud mortar.
A the forming of bricks out of mud or clay, and, after some preliminary air drying or sun drying, they are laid
B forming the mud or clay into bricks, and, after some preliminary air drying or sun drying, to lay them
C having bricks formed from mud or clay, and, after some preliminary air drying or sun drying, they were laid
D to form the mud or clay into bricks, and, after some preliminary air drying or sun drying, to lay them
E that bricks were formed from mud or clay, which, after some preliminary air drying or sun drying, were laid
分析：
There are several ways to build solid walls using just mud or clay, 是一个完整的句子，but 是一个并列连接词，那么一个完整的句子，一个逗号，再加BUT,那么but后边也应该是一个完整的句子，the most extensively used method 这是转折句子当中的主语，has been是谓语，the forming这种the+doing 的表达是很少用的， 用的前提，比如说句子当中是名词1+逗号+名词2+逗号，and后面跟了一个making，我们都知道名词强调的是结果，动名词强调的是动作，所以为了和名词强调结果能够并列的话，可能会把doing结构改成一个名词形式，但是并不是每一个动词都有它相应的名词形式，比如make,因为make的名词没有找到，所以可以采用the making的形式和名词并列。而在这里form有名词形式，所以一般情况下不会选择the forming的形式。后面紧接着出现了and这个并列连接词，after some preliminary air drying or sun drying, 这个前后都是逗号，当做插入语就可以，也就是说and后面跟的是 they are laid既然and后面跟的是完整的句子，而and前面是the doing，很明显不是并列的，看五个选择。A选项the doing 和一个句子不能并列，错误。B选项 forming and to lay them 两种结构不能平行并列，排除B。C选项doing结构和句子不能并列，排除。D选项to form and to lay,都是不定式结构，可以并列。E选项出现了 which引导的从句，在GMAT语法当中， which修饰的只能是逗号前面的就近名词，但是也不一定是最近的，比如名词1+介词+名词2，就不是修饰名词2，而是名词1.在这里which指的就是mud or clay, 但是根据逻辑明显指代错误，应该指的是bricks 。Which如果想要指代主语，只能放在主语和谓语之间或者说是主语前面，只是定语从句是不行，我们的修饰不能越过谓语动词来修饰的，所以这个which指代是错误的。所以正确答案是D.
正确句子
There are several ways to build solid walls using just mud or clay, but the most extensively used method has been to form the mud or clay into bricks, and, after some preliminary air drying or sun drying, to lay them in the wall in mud mortar.
验证：
There are several ways to build solid walls using just mud or clay, 这是there be的一个完整的句子，but是连词，前后都是两个句子并列，从句主语是most extensively used method ，has been是谓语，to form and to lay 是并列的表语，所以这个正确。
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