【題目】Thefreezingpointisthetemperature__________waterchangesintoice.

A. which B. onthat

C. atwhich D. ofwhat

【答案】C

【解析】考查定語(yǔ)從句中的介詞的選擇。冰點(diǎn)就是在那一個(gè)溫度上變成冰的。本題中的先行詞是名詞 temperature,該詞與介詞at連用。表示“在……度的時(shí)候……故選C。

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