The freezing point is the temperature water changes into ice．( )A．at whichB．whenC．in whichD．of which 题目和参考答案——青夏教育精英家教网——

题目内容

17．The freezing point is the temperature __________ water changes into ice．（　　）

A．

at which

B．

when

C．

in which

D．

of which

分析冰点是水变成冰的温度．

解答答案：A
句中water changes into ice修饰名词temperature，是一个定语从句；从句和先行词构成的结构是water changes into ice at the temperature，介词要用at．故选A．

点评定语从句是用来修饰名词的形容词性从句，相当于一个形容词．连接定语从句的引导词分为关系代词和关系副词，关系代词在从句中要作主语或宾语；关系副词在从句中作状语．这也是选择关系词的一个判断方法．

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