The teacher seldom let an opportunity to teach his

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The teacher seldom let an opportunity to teach his students or to help them make up for the days of schooling they had missed ____.   

   A. pass B. passing C. to pass D. being passed<?xml:namespace prefix="o" ns="urn:schemas-microsoft-com:office:office">

热搜:medline数据库中to字段是表示非英文文献的原文题名