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We ________ such great achievements without your efforts. Thanks a lot.
A.can’t have madeB.couldn’t have made
C.were unable to makeD.are unable to make
B

这题考查情态动词对过去的虚拟,couldn’t have done“过去不可能做…,而实际上做了”,句意是:没有你的努力,我们不可能取得这么大的进步,(而实际上取得了)。选B。
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