It's thought that the accident was caused by human error.The accident is thought to have been caused28/50Mark the letter A, B, C, or D on your answer sheet to indicate the sentence that is closest in meaning to each of the following questions It's thought that the accident was caused by human errorThe accident took place because of thoughtlessnessHumans' thoughtlessness caused the accident.The accident is thought to have been caused by human error.The accident is thought to cause human errorGiải thíchĐáp án C