英语,if 引导的句子 主句,从句,为什么if引导的句子。主将从现，那么，什么是主句，什么是从句？

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• The news that our team had won made us very happy.句中that引导的句子是定语从句吗?如果是,为什么that没有做定语从句中的任何成分?或许这本身是个错误的句子?本句引自宾语补足语的语法教程.请专家给予解惑.
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