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

31. The teacher gave us two difficult exercises.A. We were given two difficult exercises.B. Two difficult exercises were given to the teacher.C. Two difficult exercises were given us. D. We are given two difficult exercises