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Câu hỏi:

21/07/2024 1,924

Certain courses are compulsory; others are optional.

A. voluntary

B. free

C. pressure

D. mandatory

Đáp án chính xác

Trả lời:

verified Giải bởi Vietjack

Đáp án D

optional: tùy chọn >< mandatory: bắt buộc

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