Blacken the letter A, B, C, or D on your answer sh...

Câu hỏi: Blacken the letter A, B, C, or D on your answer sheet to indicate the word or phrase that is CLOSEST in meaning to the underlined part in each of the following questions.

In Britain, it is compulsory to go to school between the ages of five and sixteen.

A. legal

B. required

C. voluntary

D. comprehensive