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
考查虛擬語(yǔ)氣。根據(jù)句中but for要不是，用虛擬語(yǔ)氣，本題是對(duì)過(guò)去事實(shí)相反的虛擬語(yǔ)氣，故用could have done，選A。
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