Put the books back they belong after you have finished them.A. whereB. to whereC. to whic

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(答案→)A. where
B. to where
C. to which
D. to the place
解析：where引导状语从句，引导词在从句中作状语。C为定语从句引导词结构，B项搭配有不对，belong to后接名词，而不是副词、介词。