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主谓一致 — 英语填空题

人教版·英语(高中) Unit 5 Working the Land AI 三重审校通过

题目
根据主谓一致规则,用括号中动词的适当形式填空:A series of experiments on hybrid rice ___ (be) carried out by the research team since its founding, and each of the results ___ (confirm) the value of Yuan Longping's method.