同学你好，该知识点来自沪江网校《新概念英语第四册【天猫专享】》的课程，想要更系统的学习，欢迎进入课程学习。不仅可以和更多的同学一起学习，而且还有老师、助教随时的学习指导和知识点解答哦。

同学你好~
in which to work是“介词+关系代词+不定式”
表现形式通常为 in which to do sth, with which to do sth, on which to do sth等，其中的介词视具体语境的搭配而定。如：
She must have time in which to grow calm. 她需要有时间冷静下来。
She had no time left in which to pack her things. 她没有时间收拾行李了。
He had only the long nights in which to study. 他只有漫漫长夜可用来学习。

其实就是一种紧缩了的定语从句。在正式文体中，当引导定语从句的关系代词用作介词的宾语时，有时可用“介词+关系代词+不定式”这样的结构来简化定语从句。比较：
She must have time in which she can grow calm.=She must have time in which to grow calm. 她必须有冷静下来时的时间。

in which to work 在这里相当于in which they can work

祝同学学习进步~