英訳に間違いが有れば正してください。
That working conditions is often referred to modern day slavery.
その労働条件はよく現代の奴隷制と呼ばれている
ヒント
受動態になっているので
答え
referred toをreferred to asにする
That working conditions is often referred to as modern day slavery.
referre to＋目的語＋as＋～
目的語を～と呼ぶ
You often referred to that working conditions as modern day slavery.
