He has made (A) a lot of mistakes (B) in (C) his writing because (D) his carelessness33/64Mark the letter A, B, C, or D on your answer sheet to show the underlined part that needs correction (from 30 to 34) He has made (A) a lot of mistakes (B) in (C) his writing because (D) his carelessness made mistakes in becauseGiải thíchĐáp án là D Because + Clause= because of+ N/V_ing. -> “because of”.