Mrs Green are very grateful to the neighbour _____ helped her child out of the fire．A.whichB.whatC.whoD.how
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C解析试题分析：根据语境可知此句的先行词是the neighbor是人，且在从句中做主语故选who，故选C。考点：定语从句的引导词
点评：定语从句的引导词有关系代词who， whom，whose，which，that， as；关系副词when， where，why。定语从句中引导词的选用主要看先行词在定语从句中作什么成分或者是定语从句中缺什么成分。