You _____ have bought the book for me, but thank you all the same.
A．shouldn’tB．needn’tC．can’tD．mustn’t
B
試題分析：Shouldn’t have done 表示本不應(yīng)該做某事而實(shí)際上做了：needn’t have done表本沒有必要做某事而實(shí)際是做了； can’t have done表過去不可能做了某事；musntn’t have done形式不對。句意：你本不必給我買這本書的，但仍然謝謝你。故B正確。
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