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

24. The preparations _______ by the time the guests _______. A. had been finished / arrived B. have finished / arrived C. had finished / were arriving D. have been finished / were arrived