1．用一个恰当词完成以下句子，使之完整与正确。 ①Mr Li has three daughters，none of _____ is an engineer． ②Mr Li has three daughters，but none of _____ is a dancer． ③Mr Li has three daughters； _____ are doctors．
定语从句与并列句主要区分在于：并列句有像and，but，so等并列连词或两个句子用分号连接，这时就不能再用引导定语从句关系词了。从结构上看，①小题是定语从句，故填whom；②小题有并列连词but，是并列句，故填代词 them；③小题是两个并列分句，无需连接词，缺乏主语，故填none或they。
一、定语从句与并列句
操  练【真题1】The doctor advised Vera strongly that she should take a holiday, but ________ didn't help.   (年全国卷III)   A. it        B. she      C. which      D. ...