Thứ năm, 27/02/2025
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Câu hỏi:

20/07/2024 49

Choose a, b, c, or d that is the best alternative.

Pollution is the most important problem that all environmentalists are concerned _______ .

A. upon    

B. off  

C. about 

Đáp án chính xác

D. on

Trả lời:

verified Giải bởi Vietjack

Chọn đáp án C

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