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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
这是一个简单句,它是复杂句的基础。
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