You_________have bought food. I have lots here10/60Mark the letter A, B, C or D on your answer sheet that completes each of the following questions. You_________have bought food. I have lots hereDidn’tMustn’tNeedn’tDidn’t need toGiải thíchĐáp án là C. needn’t have done: diễn tả hành động không cần làm trong quá khứ ( nhưng đã làm )