He said: “I’m sorry I didn’t reply to the letter.”29/50Mark 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. He said: “I’m sorry I didn’t reply to the letter.”He apologized for not to reply to the letter.He apologized for not to replying to the letter.He apologized for didn’t reply to the letter.He apologized for not replying to the letter.Giải thíchĐáp án D Câu tường thuật đặc biệt cho câu xin lỗi: apologized for not + Ving