gmat语法，又叫句子改错(sentence correction)，是GMAT语文(VERBAL)三大题型中难度较高但也较容易提分的题型。因此，想要考好GMAT语法秒解难题还是需要花上一番功夫的。特别是对于考试涉及的各类语法点和疑难杂症，考生势必要多加努力才能有所收获。

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。有鉴于此新航道小编建议大家从高频热门语法点开始优先准备起来。下面新航道小编就来说明in which与where的用法区别。

GMAT语法大百科语法点：in which与where的用法说明

1. when , where 可以用在非限制性关系子句中

ex: He came from Herne Bay, where Lally had once spent a holiday.

2. when , where 也可以用在限制性子句中,但前面必须有特定的名词. 且像" Lodon" 这种专有名词的地名后面是不跟限制性子句的.

ex: This is the street where I live.

3. 在限制性子句中,

表time: 可用 at which 替代 when

表place, room, street, year, month: 可用in which 替代 where 及 when

ex: the place in which they found themselves.

表day 之后可用on which 替代 when

表 situation, stage, arrangement, system 之后, 可用 in which 替代 where, whereby.

所以, in which 常用在限制性子句中, (简单看就是前面不要有 ,)可以替代 where, when

1.时间year, month

2.地点 place, room, street,

3. 某种情境 situation, stage, state, arrangement, system

GMAT高频词汇in which与where用法实例讲解

At Shiprock, New Mexico, a perennially powerful girls’ high school basketball team has become a path to college for some and a source of pride for a community where the household incomes of 49 percent of them are below the poverty level.

(A) where the household incomes of 49 percent of them are

(B) where they have 49 percent of the household incomes

(C) where 49 percent of the household incomes are

(D) which has 49 percent of the household incomes

(E) in which 49 percent of them have household incomes

选项分析：

根据上述where和in which的用法总结，可以很轻易的判断D是不正确的

然后再按照句子意思来看，主语明显是收入，而不是人，所以排除B和E

A搭配错误，所以最后答案是C。

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