句子成分划分
They cited a study presented earlier this year of 249 pairs of parents and their children in which twice as many children as parents wanted rules on what parents could share.
请问老师，这里的in which twice as many children as parents wanted rules on what parents could share. 的先行词是谁呀，从句部分的主语有些看不懂，倍数表达法请问有什么文章推荐吗，这部分不是很懂。a study presented earlier this year of 249 pairs of parents and their children这部分的定语有些划分不清，of 249 pairs of parents and their children 可以改成about 249 pairs of parents and their children吗？麻烦老师了！！！！！！！
最佳答案 2019-06-18 09:28
They cited a study presented earlier this year of 249 pairs of parents and their children in which twice as many children as parents wanted rules on what parents could share.
They cited a study这是主谓宾
presented earlier this year 过去分词短语作study的定语，
of 249 pairs of parents and their children 介词短语作study的定语
in which twice as many children as parents wanted rules on what parents could share. 定语从句作study的定语，which的先行词为study，in which=in the study.
study的三个定语中，过去分词短语最短，定语从句最长，按照由简单到复杂的顺序依次排列。
of表示动宾关系，不能用about替换。
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