Indicate the correct answer: You __ the rules of synchronized swimming againĐoạn văn20/33Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the following questions. You _______ the rules of synchronized swimming again because everybody had understood everything then.needn't have explainedcan’t have explainedneedn't explaincan’t explainGiải thíchĐáp án A.