The sandwich was bought a week ago; I don’t think it is ______ now.14/50Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the following questions. The sandwich was bought a week ago; I don’t think it is ______ now.editableefficientedibleeffectiveGiải thíchĐáp án C Efficient: có hiệu lực Edible: ăn được Effective: có hiệu quả