Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the following questions.
Câu 17: In most _____ developed countries, up to 50% of _____ population enters higher education at some time in their lives.
A. Ø / Ø B. the / Ø C. Ø / the D. the / a
Gợi ý câu trả lời: