题目内容

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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