Carbon dioxide _______ as one of the main contributors to the greenhouse effect.
B
Câu không có trạng từ chỉ thời gian rõ ràng à chia ở thì HTHT à loại A, D
Dựa vào ngữ nghĩa à Câu mang nghĩa bị động à chọn B
Dịch: Carbon dioxide được xác định là một trong những nguyên nhân chính gây nên hiệu ứng nhà kính.
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