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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