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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

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

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 

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

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