先行词是the way，place,time,reason关系副、代词何时可省？
为什么这句要加where:
We've all used thermometers to measure temperature but sometimes we need to measure temperature in places WHERE you can't put a thermometer.
语法说，先行词是the way，表示方式，可用that（可省）或in which来引导一个定语从句。如果先行词是时 间或原因，也可用that（可省）或when或why来引导定语从句。如：
（1）This was the reason that/why he was late yesterday.
（2）This is the last time that I shall give you a lesson.
这句是道改错题，还要加上where 是什么原因？
参考答案:你自己的说明里也并没有说where可省啊?
你说的是the way作先行词, 而且要是表示方式, 那才可以省掉关系词.
跟你的这句话一点关系都没有...