David is a friend you can trust all your life．( )A．whoB．whichC．whoseD．when 题目和参考答案——青夏教育精英家教网—

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13．David is a friend _________ you can trust all your life．（　　）

A．

who

B．

which

C．

whose

D．

when

分析大卫是一个你可以终生信任的朋友．

解答答案为A．本题考查定语从句中关系词的选择．题干中空格后面是修饰和限制名词friend的定语从句，把先行词friend带入到定语从句，完整的定语从句是"you can trust the friend all your life"；可见friend 在从句中充当宾语．在定语从句中，who可以指代人，在从句中往往做主语和宾语，所以答案选择A；在定语从句中，which指代物，可以排除B；whose在定语从句中充当定语，所以排除C；定语从句中关系副词when可指代时间在从句中做时间状语，所以排除D．

点评选择定语从句中的关系词，首先要理解各关系词的用法；然后找准先行词，将先行词带入到定语从句；最后根据先行词在定语从句中的作用判断关系词．

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