英语 九年级 填空题 较难

who/that引导的定语从句 — 英语填空题

外研社版(主编:孙有中)·英语 Unit 4 Heroes AI 三重审校通过

题目
用 who 或 that 填空,每空一词。At the school exhibition, Mei introduced Dr. Lin, ___ had helped many people, and showed us a letter ___ he had written about his work.