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(2006·天津)

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:B
解析:

句意:"我们或许还没有证明是伟大的探险者,但我们已取得了在过去的10年里的最伟大的进展。"故应用may not


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