Mark the letter A, B, C, or D on your answer sheet to indicate the underlined part that needs correction in each of the following questions.

Câu hỏi

Air pollution became very serious in recent years due to human activity.

A. became

B. serious

C. due to

D. activity

Đáp án
A. became

Câu hỏi thuộc Bài tập:

Đề thi thử tiếng Anh THPT Quốc gia 2023 (Mã đề 020)