having been ill for a long time,so she ell behind her classmates为什么so是多余的?急having been ill for a long time,so she ell behind her classmates为什么so是多余的?having been ill for a long time,so she fell behind her classmates为什么so是多余的?
问题描述：
having been ill for a long time,so she ell behind her classmates为什么so是多余的?急
having been ill for a long time,so she ell behind her classmates为什么so是多余的?
having been ill for a long time,so she fell behind her classmates为什么so是多余的?
答
分词短语having been ill for a long time 作状语,表原因,so 当连词无句子可连,作副词用多余.