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(xiàng)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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