đáp án B
Kiến thức về cụm từ cố định
On a large scale = a wide range of = a variety of: trong phạm vi rộng lớn, sự đa dạng
Tạm dịch: Họ đang tiến hành một cuộc khảo sát trong phạm vi rộng khắp Việt Nam.
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