IX:
Mark the letter A, B, C,or D on your answer sheet to show the underlined part that needs correction
Trả lời câu hỏi dưới đây:
Before she moved here, Arlene had been president of the organization since four years.
Đáp án là D. since => for, vì for + khoảng thời gian , còn since + mốc thời gian