1. Since the average test score of studentsenrolled in charter schools were rising7.5 percent in the spring, many educatorsconcludedthat the system was working.
A.Sincethe average testscore(of students)(enrolled in charter schools)were rising7.5 percent in the spring, many educatorsconcluded(since引导原因状语从句不好，另外since所在从句主语是the average test score，谓语动词只能是单数，were rising直接排除。)
B. As the average test score of studentsenrolled in charter schools rose7.5 percent in the spring, with manyeducators concluding
（As引导的是从句，后面是一个自带逻辑主语的分词结果，相当于独立主格是状语功能，没有主句，直接排除）
C. Because the average test score of studentsenrolled in charter schools rose7.5 percent in the spring, many educatorsconcluded（正确）
D. Becausethe average test score（of students）（enrolled in charter schools）wereup7.5 percent in the spring, many educatorsconcluded（从句主谓不一致）
E. With average test scores rising by7.5 percent among students enrolled incharter schools,andmany educatorsconcluded
（And要求前后要平行，而and之前是独立主格形式，and之后为完整的SVO，and前后不平行直接排除。）
2. The number（of violent crimes）（committed inthe greater metropolitan area of Sao Paolo,Brazil,）more than doubledfrom 1975 to 1990by the influx of drugs（动作发出者，谓语动词只接受被动语态）.
A. more than doubled
B. increased by more than twice
C. increased more than two times
D. wasincreasedmore thandouble
E. was more than doubled（正确）
解析：谓语动词只能是被动语态，排除ABC. D选项中increase和double词义重复。注：在gmat语法中，看到double就当普通动词对待。
3. To be a great salesmanrequires strongpersonal skills, the ability to think fast,and demandsa can-do attitude.
A. requires strong personal skills, the abilityto think fast,anddemands（and后面demands和requires平行，导致skills，the ability这组平行没有并列连词，排除）
B. requires strong personal skills, the abilityto think fast, and（正确）
C. requires strong personal skills, demandsthe ability to think fast,and（and后为名词，不可以跟前面的动词平行）
D.requiringstrong personal skill, an abilityto think fast,anddemands（requiring是非谓语动词，做不了谓语，另外and后demands为谓语动词，前面没有谓语动词和其平行）
E. demands strong personal skills, an abilityto think fast,butwith（but前后不平行，另外skills和ability之间没有并列连词）
4.No less remarkable than the invention ofnuclear powerhas been the way thetechnology has prompted governments toreevaluate the nature of international relations.
A. No less remarkable than the invention ofnuclear power（正确，典型倒装结构，回复正常是the way has been no less remarkable than the invention of nuclear power.
B. Whatwasas remarkable as the inventionof nuclear power（时态不对，主从句时态不一致）
C.Inventing nuclear powerhas been nonethe less remarkable than( inventing nuclear power和the way比较对象不对等)
D. The invention of nuclear power has beennolessremarkableas（less…as..混搭错）
E. The thing thatwasas remarkable asinventing nuclear power( inventing nuclear power和the way比较对象不对等；时态用was不对，主从句时态不一致)
5.Archeological excavations of Roman ruinson the Greek island of Crete show thatsecuring control over the maritime traderoutes of the Eastern Mediterranean wasa primary goal of the Romans,as it was ofthe Greeks in preceding centuries.
A. as it was of the Greeks（正确，it形式主语，真主为securing control over the maritime traderoutes of the Eastern Mediterranean）
B. like that of the Greeks（that单数代词指代一个单数名词，没法指代securing control over the maritime traderoutes of the Eastern Mediterranean）
C. as that of the Greeks（as表像是连词，后面接句子，另外that同B错）
D. just as the Greeks did（主语是the Greeks和主句主语不对应，排除）
E. as did the Greeks（和D选项本质一样，只是倒装而已）
注：just as一般出现在just as A V, so B V句式中。
6. Hip dysplasia ismorecommon amongGerman shepherdsthandogs of other breeds.
A. than
B. than is so of
C. compared to
D. in comparison with
E. than among（正确）
解析：比较结构中more和than成对出现，另外比较时介词尽量保留，介词是表达事物之间关系的词汇，有介词就会减少歧义发生的可能性）
7. Under SEC guidelines, a company in thissituation is requiredeitherto submit revisedfinancial statementsorthat they withdrawtheir plansfor a public stock offering.
A. that they withdraw their plans
B. to withdraw its plans（正确）
C. that it withdraw planning
D. to have been withdrawn fromtheirplans
E. it should withdraw its plans
解析：either…or平行结构，要求前后平行，只能选择不定式，另外代词只能使用单数，因为指代的是a company。
8. Visitors to the park have often looked up into the leafy canopy andsaw monkeys sleeping on the branches, whose arms and legs hanglike socks on a clothesline.
(A)sawmonkeyssleeping on the branches,whosearms and legs hang
(B)sawmonkeyssleeping on the branches,whosearms and legs were hanging
(C)sawmonkeys sleeping on the branches, with arms and legs hanging
(D)seen monkeys sleeping on the branches,（with）arms and legs hanging（独立主格形式，正确）
(E) seenmonkeyssleeping on the branches,whosearms and legs have hung.
首先，此处是时态问题，visit和see动作时态没有差异的标志，只能选择seen，不可以使用saw。另外whose就近指代branches不对，arms and legs是猴子的。
我们优先选择独立主格的形式，独立主格是自带自己逻辑主语的分词结构位置灵活。
9.Althougha surge（in retail sales）have raised hopes that there is a recovery finallyunderway, many economistssaythat without a large amount of spending the recovery might not last.
(A)have raisedhopes that there is a recovery finally（主谓不一致）
(B) raisedhopes for there being a recovery finally（主从句时态不一致）
(C) had raisedhopes for a recovery finallybeing（being+形容词错）
(D) has raised hopesthat a recovery is finally（hopes的同位语从句）（正确）
(E) raisedhopes for a recovery finally（主动句时态不一致）
注：当句子没有明确时间概念时，通过主从句时态一致去判断句子时态，一般规则是过去对应过去（过去包含过去完成时态和一般过去时态）现在对应现在（现在包括一般现在，现在完成时态，一般将来时态）.
10.Efforts1. Since the average test score of studentsenrolled in charter schools were rising7.5 percent in the spring, many educatorsconcludedthat the system was working.
A.Sincethe average testscore(of students)(enrolled in charter schools)were rising7.5 percent in the spring, many educatorsconcluded(since引导原因状语从句不好，另外since所在从句主语是the average test score，谓语动词只能是单数，were rising直接排除。)
B. As the average test score of studentsenrolled in charter schools rose7.5 percent in the spring, with manyeducators concluding
（As引导的是从句，后面是一个自带逻辑主语的分词结果，相当于独立主格是状语功能，没有主句，直接排除）
C. Because the average test score of studentsenrolled in charter schools rose7.5 percent in the spring, many educatorsconcluded（正确）
D. Becausethe average test score（of students）（enrolled in charter schools）wereup7.5 percent in the spring, many educatorsconcluded（从句主谓不一致）
E. With average test scores rising by7.5 percent among students enrolled incharter schools,andmany educatorsconcluded
（And要求前后要平行，而and之前是独立主格形式，and之后为完整的SVO，and前后不平行直接排除。）
2. The number（of violent crimes）（committed inthe greater metropolitan area of Sao Paolo,Brazil,）more than doubledfrom 1975 to 1990by the influx of drugs（动作发出者，谓语动词只接受被动语态）.
A. more than doubled
B. increased by more than twice
C. increased more than two times
D. wasincreasedmore thandouble
E. was more than doubled（正确）
解析：谓语动词只能是被动语态，排除ABC. D选项中increase和double词义重复。注：在gmat语法中，看到double就当普通动词对待。
3. To be a great salesmanrequires strongpersonal skills, the ability to think fast,and demandsa can-do attitude.
A. requires strong personal skills, the abilityto think fast,anddemands（and后面demands和requires平行，导致skills，the ability这组平行没有并列连词，排除）
B. requires strong personal skills, the abilityto think fast, and（正确）
C. requires strong personal skills, demandsthe ability to think fast,and（and后为名词，不可以跟前面的动词平行）
D.requiringstrong personal skill, an abilityto think fast,anddemands（requiring是非谓语动词，做不了谓语，另外and后demands为谓语动词，前面没有谓语动词和其平行）
E. demands strong personal skills, an abilityto think fast,butwith（but前后不平行，另外skills和ability之间没有并列连词）
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