A．may not

　　B．needn't

　　C．can't

　　D．mustn't

　　答案为B项。句意：既然Suzie不与我们一起吃晚饭，我们原本不必买那么多食物。needn't have done表示原本不必要做某事，但事实上已经做了。

　　考点九：虚拟语气在虚拟条件句中的用法

　　虚拟情况 从句谓语 主句谓语 例句

　　与现在事

　　实相反 过去式

　　(be用were) would/should/could/might do If he were here，he might be able to help.What would you do if you were in his place？

　　与过去事

　　实相反 had done would/should/could/might have done If I had started a little earlier，I would have caught the train.

　　I could have done it better if I had been more careful.

　　与将来事

　　实相反 过去式/

　　were to do/

　　should do would/should/could/might do If I were to do it，I would do it in a different way.

　　I would certainly go if I had time.

　　1.在具体运用中，条件从句中有时可省略if而采用倒装结构。如：

　　Had it not been for your help，we wouldn't have achieved so much.

　　2．介词without/but for、连词but、副词otherwise常用来表示某种假设条件。如：

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