Re:Kaythomas 兄请再进
what a disgraceful light it places Mr. Darcy,
remember the phrase" in the light of"? "light " here is with the same function as that in the phrase.
it和to be treating his father's favourite in such a manner为同位语成分
the red part should be: do but consider in what a disgraceful light it places Mr. Darcy, to be treating his father's favourite in such a manner,
...consider that Mr. Darcy was once put in what a kind of disgraceful situation by treating ...