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:我真的不知道該怎樣感謝你,沒有你的幫助,我不可能找到我丟失的項鏈。couldn't have done表示對過去情況的否定推測,意為“不可能”。

 

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