◎ 题干
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
◎ 答案
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◎ 解析
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◎ 知识点
    根据n多题专家分析,试题“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'…”主要考查了你对  【情态动词】  等知识点的理解和应用能力。关于这些知识点的“档案”,你可以点击相应的链接进行查看和学习。