The exercise -with-answer -key format makes the book suitable ________ self-study.Đoạn văn22/60II. LANGUAGE FOCUSa. Choose the one word or phrase -a, b, c, or d - that best completes the sentences.The exercise -with-answer -key format makes the book suitable ________ self-study.for to of inGiải thíchĐáp án đúng là a.