有求各位了，先谢谢大家

We are going to spend the Spring Festival in Guangzhou, __________ live my grandparents and some relatives.
A. which
B. that
C. who
D. where
选:D. where
关系词在从句中作状语.从句的主语my grandparents and some relatives
从句倒装了.也可以写成:
We are going to spend the Spring Festival in Guangzhou,where my grandparents and some relatives live.
此句是非限制性定语从句.

D. where 引导地点状语从句
因为Guangzhou是一个地方，而grandparents and some relatives住在那，所以这句必须用where连接，也就是对Guangzhou这个地方的解释。
主语也就是where了。

D
where 引导地点状语从句

这样分析：如果让你翻译：我祖父母和一些亲戚住在广州。应该是：My grandparents and some relatives live in Guangzhou. 所以用where.

要用which的话，后面半句应该是in which live my grandparents and some relatives

where

D 状语