PHẦN 3: ĐỀ ÔN LUYỆN THI PRACTICE TEST 2

Mining (A) over 2,000 years ago (B), copper is one of the (C) earliest known (D) metals.

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Mining (A) over 2,000 years ago (B), copper is one of the (C) earliest known (D) metals.

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Giải thích

Chọn A