【题目】Thefreezingpointisthetemperature__________waterchangesintoice.
A. which B. onthat
C. atwhich D. ofwhat
在线课程【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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