定语从句关系代词所代替的先行词是人或物的名词或代词,并在从句中充当主语、宾语、定语等成分.关系代词在定语从句中作主词保持一致. 1,who, whom, that　　这些词代替指人,“whom”作宾语指人,"who"和“that”既可作...