—Look，I’ve bought some bread，including your favorite flavor.
—You any because we still have plenty at home.
A. should have bought
B. could have bought
C. needn’t have bought
D. mustn’t have bought
网友回答
A. should have bought
B. could have bought
C. needn’t have bought
D. mustn’t have bought
解析：C
解析 答语句意为：你没有必要买，因为家里还有很多。故应用needn’t have done表示本不必做而实际上做了。could have done 表示过去本可以做某事却没做；should have done表示本应该做而实际上未做；mustn’t表示禁止。