It's the objective case of they.

是they宾。

In formal writing, yes, when it's appropriate, when you need the object pronoun, sure, use " whom" !

在正式写作中，在适当时候使用，当你需要宾时候，当然要用 whom！

" Whom, not who, your Highness, " said Doctor Cornelius. " Perhaps it is time to turn from History to Grammar."

“应该用宾‘’，不是主，王子殿下。”克奈尔斯博士说，“也许我们该结束历史课，开始学习语法了。”

Bingley was the principal spokesman, and Miss Bennet the principal object.

宾莱是主要发言人，班纳特小姐是主要对象。

I am not particularly speaking of such a case as you have supposed about Mr. Bingley.

我并不是特别说你对宾莱先生想象。

She is a very great favourite with some ladies of my acquaintance, Mrs. Hurst and Miss Bingley.

她是我认识一女士，赫斯特夫人和宾利小姐宠儿。

She endeavoured to persuade herself that she did not regret it; but she could no longer be blind to Miss Bingley's inattention.

她努力说服自己，她并不后悔;可是她再也不能对宾莱小姐漫不经心视而不见了。

So Jack relies on help from Max, a seven-year-old English Springer Spaniel who's an expert in sniffing out a telltale sign of a koala's presence.

所以杰克依靠一条英国英国史宾犬帮助，马克斯，今年七岁，是能够嗅探到考拉存在专家。

Miss Bingley's eyes were instantly turned towards Darcy, and she had something to say to him before he had advanced many steps.

宾莱小姐眼睛立刻转向达西，在他向前走了好几步之前，她还有话要对他说。

Liberman says that researchers looking at COCA found that " me and someone" is " about three times more common than 'someone and me.' "

利伯曼说，研究人员研究美国当代英语语料库发现，“（宾）我和某人”在使用中常见频率是“某人和我（宾）”三倍。

We use 'tell' without a personal object in a few expressions, that are kind of fixed expressions like tell the truth, tell the time and tell the difference.

用Tell时候，一般带人称宾，只在少数固定表达中不会用到，如， tell the truth讲实话, tell the time看时间 和tell the difference说出差异。

Not only is the preposition before the relative pronoun, but the speaker has used " whom" , which is an object form of " who" and is also formal.

不只是因为介词在关系代词前面，还因为说话者用了 “whom”，是 “who” 宾形式，而且很正式。

" cried Mrs. Bennet, as she stood at a window the next morning, " if that disagreeable Mr. Darcy is not coming here again with our dear Bingley!

“第二天早晨，班纳特太太站在窗前喊道，”如果那个讨厌达西先生不和我们亲爱宾莱一起再来这里就好了！

To the civil enquiries which then poured in, and amongst which she had the pleasure of distinguishing the much superior solicitude of Mr. Bingley's, she could not make a very favourable answer.

对于随后涌入民间询问，她有幸地分辨出宾莱先生关怀要高得多，她不能做出一个非常有利回答。

He addressed himself directly to Miss Bennet, with a polite congratulation; Mr. Hurst also made her a slight bow, and said he was " very glad; " but diffuseness and warmth remained for Bingley's salutation.

他直接对班纳特小姐说了一句礼貌祝贺。赫斯特先生也向她微微鞠了一躬，并说他“非常高兴”。但宾莱问候仍然弥漫和温暖。

Were it for nothing but his love of you, I must always have esteemed him; but now, as Bingley's friend and your husband, there can be only Bingley and yourself more dear to me.

如果不是因为他爱你，我一定一直很尊敬他;但现在，作为宾莱朋友和你丈夫，我只能更珍视宾莱和你自己了。