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【题目】Thefreezingpointisthetemperature__________waterchangesintoice.

A. which B. onthat

C. atwhich D. ofwhat

【答案】C

【解析】考查定语从句中的介词的选择。冰点就是在那一个温度上变成冰的。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……故选C。

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