14/12/21 Câu hỏi: Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the following questions. My mother used to___________research in this library when she was a student. A. make B. do C. making D. doing Lời giải Do research: nghiên cứu Đáp án B. Click để xem thêm...
Câu hỏi: Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the following questions. My mother used to___________research in this library when she was a student. A. make B. do C. making D. doing Lời giải Do research: nghiên cứu Đáp án B.