请问一下这句话为什么用which而不用where呢？是因为主句 有 in了吗？
It is sheduled to be held in NEW YORK,which is the most developed area in American.RT求详解
推荐回答（5个）
It is sheduled to be held in NEWYORK,which is the most developed area in American.
不是，是因为先行词是New York，在定语从句里做主语，只能是关系代词，不能是关系副词。
It is sheduled to be held in New York是主句，逗号以后是定语从句，引起定语从句的关系词可以是which 也可以是where, 但是要看它代替的词New York在定语从句中充当什么成分，如果作地点状语则用where，而本句是作主语，is是系动词谓语，所以只能用关系代词which作主语。
这句话which引导的从句是用来形容前面New York的定语从句，从句缺少主语成分，所以这里需要一个名词性的部分，用which来担当。
而where引导的通常是状语从句，在从句中作状语成分，从句除去where以后还是结构完整的。
另外，题主所说的主句中有in，对定语从句影响不大。但是如果是状语从句，可以记住where=in which。
It is scheduled to be held in New York, which is the most developed area in American.
它计划在纽约举行，这是美国最发达的地区。
which引导定语从句，修饰New York, which在定语从句中作主语，跟前面的in没有关系。
要用where引导，where必须在从句中作状语。
It is scheduled to be held in New York, where you can find many famous companies.
where引导定语从句，在定语从句中做地点状语。
which 引导非限制性定语从句，在从句中作主语，where 不能作主语
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