Core Vocabulary: Phrasal Verbs Everyday (Error Correction) (B1) #29
They turned down the offer because it was too expensive, but now they regret about it.
They turned down the offer because it was too expensive, but now they regret it.You can try 3 times. After that, you can choose to see the answer.
The error is the unnecessary preposition ‘about’ after ‘regret’.