Question

Mr.Jones,__I was working for,was very generous about overtime payments.能不能填for which？？

Answer 1

不可以填for which，指具体某个人，得用 who/whom。

双语例句：

He has been publicly disgraced for offences for which he was not guilty.

他为莫须有的过错而被当众免职。

I was appointed to a post for which I had little relish.

我被任命担任我不喜欢的职务。

A mischievous allegation for which there is not a shred of evidence.

毫无证据的恶意指控。

They go off and tell untruths about organizations for which they worked.

他们离开后都会说一些关于原单位的假话。

They were precipitated into a conflict for which they were quite unprepared.

他们陷入了一场不期而来的冲突。

Answer 2

不能，定语从句中已经有了for 了，不能再用for了，此外，指代人的关系代词是who/whom

Answer 3

不能，因为which 引导的非限制性定语从句，和working for 的for重复了。
根据语境，可以选择指代mr,jone的关系代词who/whom

Answer 4

不可以填for which
指具体某个人，得用 who/whom