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
A　句意：我真的不知道該怎樣感謝你，沒(méi)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(duì)過(guò)去情況的否定推測(cè)，意為“不可能”。
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