英语 高一 填空题 较难

定语从句(关系代词who/which/that) — 英语填空题

外研社版·英语(高中) Unit 4 Friends forever AI 三重审校通过

题目
用 who、which 或 that 填空:Lena, ___ has stayed in touch with me for years, still keeps the letters, ___ I sent her from my new school, in a small box.