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高频动词与词组辨析 — 英语词汇题

大学英语四级(CET-4) 核心词汇与语法 AI 三重审校通过

题目
The university library recently ____ a new rule requiring students to return overdue books within 7 days, aiming to ensure fair access for all users. The previous policy had been too lenient and needed immediate change.