Mark the letter A, B, C or D on your answer sheet to indicate the correct answer to each of the following questions.

Câu hỏi

Traffic fumes contribute greatly to air ______ in this city.

A. pollute

B. polluter

C. pollutant

D. pollution

Đáp án
D. pollution

Câu hỏi thuộc Bài tập:

E10- I-learn- Unit 8 (2)