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：本題考查情態(tài)動(dòng)詞的用法。may not have done…，表推測。句意：我們可能么沒有證實(shí)我們是多么偉大的冒險(xiǎn)家，但我們在近十年里進(jìn)行了最長的行軍。

 

 

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