It is recognized that the part ___ the UN plays in international relations is importantA.in whichB.whereC.thatD.of which
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C解析试题分析：考查定语从句。the part是先行词，play a part in在......中扮演角色，定语从句缺少宾语，用that/which引导定语从句；A、B作状语，D作定语，相当于whose，排除A、B、D。故选C。考点：考查定语从句