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Alex changed his mind at the last minute,otherwise we ________ an agreement.

A.should have reached B.could have reached
C.can reach D.should reach

B

解析句意为:亚历克斯最终改变了主意,否则的话我们就会达成一致了。对过去事情的推测,应该使用“情态动词+have done”。should have done应该已经做了……;could have done很可能已经做了……。所以应该选择B项。

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