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We ______ have proved great adventurers, but we have done the greatest march ever made in the past ten years.

       A.needn’t                 B.may not              C.shouldn’t             D.mustn’t

 

B.

解析:本题考查情态动词的用法。may not have done…,表推测。句意:我们可能么没有证实我们是多么伟大的冒险家,但我们在近十年里进行了最长的行军。

 

 

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