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掌握从句要点，选择合适的连接词。 定语从句中的关系词要作成分，关系代词that, which，as通常作主语或宾语；whose作定语；关系副词where，when，why通常作状语。that在其引导的名词性从句中只起引导作用，不作成分；而连接词what在从句中起双重作用，既作成分又能引导句子。做题时，首先要分析从句成分，选择合适的连接词。例如： As a mother，I seldom give my children so difficult a job________they can't do actively. A．thatB．as C．whichD．if [解析]在so...that结构中that引导的是状语从句，状语从句的结构完整，that在句子中不作成分。so...as结构中，as引导定语从句，as在定语从句中作主语或宾语。如果选that的话，do后面缺少宾语，句子结构就不完整了。分析job后面的句子可知，动词do缺少宾语，故空格处要填一个关系代词来引导一个定语从句修饰job；考虑到前面的so，这里应填as与之搭配。不要把这个句子看成是so...that结构。 [答案] B 语法精要十 定语从句 1.关系代词引导的定语从句 引导定语从句的关系代词有who，that，whom，which，whose，as。如： The book that(which) he is reading was written by LuXun. 他正在读的那本书是鲁迅写的。 She is a student(whom/that)we should learn from 她是个我们该向她学习的学生。 Is there anyone in your class whose mother is a doctor? 你们班是否有母亲是医生的同学？ He usually has a short sleep after lunch，as is his habit. 正如他的习惯，他总是在午饭后小睡一会儿。 Such a person as you described doesn't exist. 像你描述的这样一个人不存在。 | 
