We __________ have proved great adventurers, but we have done the greatest march ever made in the past ten years.
A．needn’tB．may not
C．shouldn’tD．mustn’t
B。
比較：needn’t have done意為“本來不必做某事”，may not have done意為“(過去)可能沒有做某事”，shouldn’t have done意為“本來不應(yīng)該做某事”(must表推測時(shí)不用于否定式)。根據(jù)句意，顯然只能選B。
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