题目内容

I really don’t know how to thank you , but for your help, I ______ my lost necklace．
A．couldn’t have foundB．mustn’t have found
C．couldn’t findD．wouldn’t find
A
考查虚拟语气。根据句中but for要不是，用虚拟语气，本题是对过去事实相反的虚拟语气，故用could have done，选A。
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