问题补充：
Microblog is a platform people can express their thoughts, show their daily life and communicate with each other by sending post.
A. what
B. which
C. where
D. when
答案：
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。
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