______ in large quantities in the Middle East, oil became known as black gold because of the large profit it brought

Câu hỏi :

______ in large quantities in the Middle East, oil became known as black gold because of the large profit it brought.

A. Discovering

B. which was discovered

C. Discovered

D. That when discovered

* Đáp án

C

* Hướng dẫn giải

Đáp án C

Discovered ---> mệnh đề quan hệ rút gọn bằng quá khứ phân từ vì câu mang nghĩa bị động.

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