That was about three months before the first identified coronavirus disease case in Italy, they said in an early release of their article in the February 2021 issue of the journal.
老师您好，请问逗号后they said…是插入语吗？
是的，逗号后为插入语分句。逗号前为自由间接引语。所谓自由间接引语，就是引语作了主句，而引述分句以插入语的形式出现。例如：
He said he would come. 间接引语作宾语。
He would come, he said. 引语作了主句，he said为插入语分句。—— 自由间接引语。
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