The boss in __ department Mr King worked had heard about the accident .答案为什么whose麻烦详细说明,谢谢

谢谢。 主体部分应该是：The boss had heard about the accident. in whose department Mr King worked 做the boss的定语，是说King先生所工作部门的

原句意思应该是：King先生工作的那个部门的boss已经听过这次事故了。
把句型变换一下是这样的：
The boss, whose department Mr King worked in, had heard about the accident.
不知道这样是不是好理解一点呢

这个题考查定语从句
先把句子分开一下：
The boss had heard about the accident .
Mr King worked in the boss' department.
可见 翻译如下：
那个老板听说了事故,李明就在这个老板所在的部门.
in the boss' department= in whose department
whose指代先行词boss 在定语从句中做定语
而在这个定语从句in whose department Mr King worked中
in whose department 又充当worked的地点状语

The boss had heard about the accident .是主句。 in __ department Mr King worked 是定语从句。whose与department是所属关系。故用whose