Tài liệu ôn thi tốt nghiệp tiếng anh lớp 12 - CHỦ ĐỀ NGỮ PHÁP NĂM 2021 - 2022 1. A. PRESENT AND PAST TENSES A. Choose the best answer among A, B, C or D to complete each sentence. 1. He was writing to his friend when he __________a noise. A. was hearing B. heard C. had heard D. hears 2...