★that在这里起什么作用★
问题描述：
★that在这里起什么作用★
People who work in offices are frequently referred to as'white-collar workers'for the simple reason that they usually wear a collar and tie to go to work.
that在这句话里起什么作用?
答
reason的同位语以引导同位语从句对reason进行解释补充