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Câu hỏi:
Humans_____ atmospheric carbon dioxide concentration by a third since the Industrial Revolution began.
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A.
increase
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B.
have increased
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C.
had increased
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D.
were increasing
Lời giải tham khảo:
Đáp án đúng: B
Hãy trả lời câu hỏi trước khi xem đáp án và lời giải -
A.
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QUẢNG CÁO
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