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

30. If it _______ warm yesterday, we would have gone to the beach.A. was B. were C. had been D. could beMark the letter A, B, C or D to show the underlined part that needs correction.