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He helped popularize the idea that some diseases not previou

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He helped popularize the idea that some diseases not previously thought to have a bacterial cause were actually infections,which around much controvery when it was first suggested.the idea 后面的同位语从句不太明白 怎么只有not 没有be动词呢?
He helped popularize the idea that some diseases not previou
我是这么理解的 从not一直到cause是一部分定语来修饰some diseases
the idea后面这个同位语从句真正的谓语动词是were
再问: 你的意思是some diseases which are not previously thought to have... 省略了which are 是吧??
再答: 不对 我不是那意思 diseases 后不是定语从句 那些只是定语 定语从句中不会出现省略主语和谓语的
再问: 不是 分词作定语 么??
再答: 我告诉你我的想法 我不确定对不对 我觉得是过去分词作定语 thought 是过去分词作定语