报道类长难句分析 — 英语填空题
题目
分析下列报道类长难句：The scientists, whose findings on salt-tolerant rice were published last month, are now working in the fields that once were considered useless for farming. 句中共有___个定语从句；第一个定语从句的先行词是___，第二个定语从句的引导词在从句中作___（填主语/宾语/定语）。