Question

You could look for a job in big cities where workers are bet

Answer 1

你好:

先行词是 cities 在主句 You could look for a job in big cities 中 作的是状语

先行词在从句中做状语时,应选择关系副词 而 which 和 that 都是关系代词 所以用 where 再者, where 就其实际意义 "哪里" 也是表示地点的 这个与cities 是比较合理的搭配