_______ in large quantities in the Middle East, oi...
Câu hỏi: _______ in large quantities in the Middle East, oil became known as black gold because of the large profit it brought.
A. That when discovered
B. Discovered
C. Discovering
D. Which was discovered
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Đề thi thử THPT QG môn Tiếng Anh năm 2020 - THPT Nguyễn Trung Trực - Kiên Giang