Choose the word or phrase that is OPPOSITE in meaning to the underlined part in each of the following sentences.

Câu hỏi

Primary education in the United States is compulsory.

A. selective

B. optional

C. free of charge.

D. required

Đáp án
B. optional

Câu hỏi thuộc Bài tập:

Tiếng Anh 9-Unit 9