题目内容

The freezing point is the temperature __________ water changes into ice.
A．atwhichB．whenC．inwhichD．ofwhich
A

试题分析：考查定语从句中的介词的选择。本题中的先行词是名词 temperature,该词与介词at连用，表示“在…度的时候”；句意：冰点就是在那一个温度上水变成冰。故A正确。
点评：本题是把定语从句中的介词提前到关系词的前面，定语从句的关系词前面的介词有三种来源：先行词的固定搭配，定语从句中的固定搭配，以及根据句子的意思选择的介词。
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