The temperature ________water begins to boil is 100 C.A.in that B at which C in which D.at that选哪个?为什么?还有这句话的意思

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The temperature ________water begins to boil is 100 C.
A.in that B at which C in which D.at that
选哪个?为什么?还有这句话的意思

选B.
你先想,
Water begins to boil at 100℃.
速度、以……速率、温度、在日落时、在……核心要用at.
然后这个从句要修饰temperature,把at挪到前面,要用到which,就变成了
The temperature at which water begins to boil is 100℃.

B,
定语从句。水在达到100度的时候会沸腾。
water begins to boil is 100 C.在。。。温度,水沸腾。用at

B temperature是先行词 at which water begins to boil 是定语
水开始沸腾的温度是100摄氏度

是主语从句.简单来说这句话就是The temperature is 100 C.剩下的都是用来解释 temperature 的,是什么样的温度呢?是水开始沸腾的温度,而在什么样的温度下要用at 这是固定用法