英语 高三 填空题 较难

描述性从句:非限制性定语从句 — 英语填空题

人教版·英语(高中) UNIT 1 SCIENCE AND SCIENTISTS AI 三重审校通过

题目
用非限制性定语从句的适当关系词补全句子,每空一词:The research team published three papers, the second of ______ focused on climate change, in ______ introduction the professor explained the new method in detail.