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Câu hỏi:
(24).....................
- A. in
- B. with
- C. on
- D. at
Lời giải tham khảo:
Đáp án đúng: C
Kiến thức: Giới từ
Giải thích:
Cụm từ: concentrated on sth: tập trung vào việc gì
Tạm dịch: Việc nghiên cứu tập trung vào môi trường xã hội...
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