Microblog is a platform people can express their thoughts, show their daily life and municate with each other by sending post.
A. what
B. which
C. where
D. when
网友回答
A. what
B. which
(答案→)C. where
D. when
解析：考查定语从句的引导词。分析句子结构可知，此处platform表示地点“平台”，故引导词用where，在从句中作状语，相当于on which。