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

這題考查情態(tài)動詞對過去的虛擬，couldn’t have done“過去不可能做…，而實際上做了”，句意是：沒有你的努力，我們不可能取得這么大的進步，（而實際上取得了）。選B。
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