EXERCISE 3I. CHỌN TỪ/ CỤM TỪ THÍCH HỢP (ỨNG VỚI A, B, C, D) ĐỂ HÒAN TH...

40. Many adults learn English because ________. A. their work is useful B. they want to go abroad C. most of their books are in English D. it helps them in their work Mark the letter A, B, C or D to show the underlined part that needs correction.