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I really don't know how to thank you, but for your help, I ________ my lost necklace.

A.couldn't have found B.mustn't have found

C.couldn't find D.wouldn't find

 

A

【解析】A 句意:我真的不知道该怎样感谢你,没有你的帮助,我不可能找到我丢失的项链。couldn't have done表示对过去情况的否定推测,意为“不可能”。

 

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