III:
Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the following questions.
Trả lời câu hỏi dưới đây:
By the end of this year, Chen ________ English for three years, but he will still need more training and experience before he masters the language.
Đáp án là A. by + mốc thời gian (tương lai ) => dùng thì tương lai hoàn thành hoặc tương lai hoàn thành tiếp diễn.