The teacher has done his best to help all students. However, none of them made any effort on their part50/50Mark the letter A, B, C or D on your answer sheet to indicate the sentence that best combines each pair of sentences in the following questions. The teacher has done his best to help all students. However, none of them made any effort on their part.Nhập câu trả lời ở đây0/3000 ký tựXác nhậnGiải thíchĐáp án B