Trắc nghiệm ôn tập
Humans_____ atmospheric carbon dioxide concentration by a third since the Industrial Revolution began.
Câu hỏi:
Humans_____ atmospheric carbon dioxide concentration by a third since the Industrial Revolution began.
A.
increase
B.
have increased
C.
had increased
D.
were increasing
Đáp án đúng: B
Đăng bởi: Monica.vn
Bạn đang xem: Humans_____ atmospheric carbon dioxide concentration by a third since the Industrial Revolution began.
Chuyên mục: Câu hỏi Trắc nghiệm
Tag: Humans_____ atmospheric carbon dioxide concentration by a third since the Industrial Revolution began.
