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

27. A: “ You met Mr. John yesterday. What did he say?”B. “ He told me that he had written a letter to congratulate his friend_________ being elected the head of the committee”A. for B. on C. at D. to