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可尝试扩展句子。越复杂的句子,分析结果越丰富。
As is often the case, we have worked out the production plan.
这是一个简单句,它是复杂句的基础。
we主语
have worked out •••谓语动词短语(复合结构)
the production plan.宾语
As is often ··· case,