改错：Theytalkedforaboutanhourofincidents,mostofthemhappen...

问题详情：

改错：They talked for about an hour of incidents, most of them happened recently.

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【回答】

them→which　两个句子之间没有连词连接，应该把代词them改为具有连接作用的关系代词。介词of后指物的关系代词应用which。

知识点：定语从句

题型：短文改错