We ______ such great success without your efforts. Thanks a lot.
A．shouldn’t have accomplishedB．couldn’t have accomplished
C．were unable to accomplishedD．mustn’t have accomplished
B
考查虛擬語氣。句意：沒有你的努力，我們不可能取得如此大的成功。謝謝你。“could+have+done”表示對過去事情的假設，意思是本來能夠做某事而沒有做。故選B。
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