这都是定语从句的考察…在一个句子中,不能出现两个主语（有并列连词的除外.注：并列连词就是and but之类的）第一句…是非限制性定语从句,你可以理解为没有并列连词,用了them what这些名词性成分的就有两个主语了…第二句没什么意思,就是一个插入语…做比较.第三句就是涉及到定语从句的关系代词和关系副词了…可知第三句的定语从句不是完整句…即缺少宾语…所以用关系代词which…而why是关系副词…所以不能用
The growing speed of a plant is influenced by a number of fa
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