一、先行词分不清 1.The book is still______you left it. A.where B.there C.there where D.which 2.I went upstairs____I heard someone crying. A.where B.when C.that D.which 第1题容易误选C,第2题容易误选A,即将there,upstairs等副词误看作先行词。定语从句是对名词或代词的修饰,而there,upstairs是副词,其后不能接定语从句。正确答案为:第1题选A,where引导表语从句;第2题选B,when引导时间状语从句。