Mark Zuckerberg is the founder of the site Facebook, you can have a
look at each other’s pictures.
A. where
B. which
C. when
D. as
网友回答
(答案→)A. where
B. which
C. when
D. as
解析：
这题考查定语从句的用法，where引导定语从句修饰Facebook，而且where在定语从句中做地点状语，句意是：Mark Zuckerberg 是Facebook的创始人，在facebook你可以看见彼此的照片。选A。