B. Discovered
Đáp án B.
Mệnh đề quan hệ rút gọn bằng quá khứ phân từ vì câu mang nghĩa bị động.
Dịch: Được phát hiện với số lượng lớn ở Trung Đông, dầu được biết đến như là vàng đen vì lợi nhuận lớn mà nó mang lại.
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