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

20. – Oh no! I completely forgot we were supposed to pick Jenny up at the air port thismorning.- She _______ there waiting for us.A. needn’t sit B. might still sit C. must still be sitting D. should have sat