the freezing point is the temperature_ water changes into ice 选项选when 和atwhich 都可以不?

题目

the freezing point is the temperature_ water changes into ice 选项选when 和atwhich 都可以不?
请某位专家老师回答哦

答案

填where 或 at which 都是对的.
这是定语从句,先行词temperature,关系副词在从句里做地点状语,故填where.at which 逻辑上即at the temperature,=where.

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