The part of the sentence "has been particularly upset" is correct and usable in written English.
You could use it when you want to emphasize that someone has been feeling very emotional about something. For example, "John has been particularly upset since his dog passed away last month."
Thorn continues to voice his support for Scott, but he has been particularly upset by the team's lackluster rebounding.
Mr. Sarbanes has been particularly upset at the Treasury's slow response and Mr. Hawke's lackluster answers to his concerns about a new Federal program to transfer electronically all Government checks to their recipients.
Ms. Nettles has been particularly upset by the attacks on Mr. Bloch, who worked at the college for 25 years before being named interim president last fall: "Andrezj is probably one of the best people I've ever known".
Some at the network have speculated that former "Nightly News" anchor Tom Brokaw isn't a fan of Williams and has been particularly upset about his successor's admittedly false claim about his Iraq war reporting.
Some freelance writers have been particularly upset at seeing their lovingly crafted exclusive interviews appear in a new guise on Mail Online.
He also said his daughter had been particularly upset by the timing of the email, which Mrs Bourne sent three times in one day, shortly after Ms Withers and her fiancé had bought their first home.
Mr. Pompidou is said to have been particularly upset by the proximity of the demonstrators as he was escorted by the police into Palmer House hotel on Sunday night.
Local residents said Mr. Jesselli had been particularly upset after an openly gay man moved in next door, repeatedly yelling at the neighbor about party noise, parking and even landscaping.
In recent months, the board's critics have been particularly upset by a case filed by its acting general counsel, Lafe Solomon, that accuses Boeing of illegally retaliating against union members in Washington State when it decided to build a $750 million aircraft assembly plant in South Carolina.
The lead had changed hands four times in the last three and a half minutes and here was Semeka Randall, the Tennessee guard who had been particularly upset when the No. 1 Huskies beat the Lady Vols in Knoxville three weeks ago, looking at Shea Ralph and taking a step to her right.
Ms. German said she had not been a fan of President Clinton, had been particularly upset about the scandals and viewed Mrs. Clinton as guilty by association.
