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可尝试扩展句子。越复杂的句子,分析结果越丰富。
By the end of last year, another new gymnasium had been completed in Beijing
简单句 包含的语法知识点都比较少,可以试试扩展成分让其变得复杂。
another new gymnasium主语
had been completed谓语动词短语(复合结构)(被动语态)
By the end ··· year,、in Beijing