2. 外语
  3. The temperature ______ Fahrenheit and Celsius thermometer readings are equal is 40 degrees below zero.

The temperature ______ Fahrenheit and Celsius thermometer readings are equal is 40 degrees below zero.

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问题 The temperature ______ Fahrenheit and Celsius thermometer readings are equal is 40 degrees below zero.
选项 A、by which
B、for which
C、to which
D、at which
答案D
解析 定语从句题。句子主干为The temperature is 40 degrees below zero，中间的定语从句，修饰限定The temperature。将先行词The temperature带入从句，即还原为：Fahrenheit and Celsius thermometer readings ale equal——the temperature。只有at能与the temperature搭配，句意通顺。
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