A hard-working man__ _______become a great scientist, but a great scientist__________
be a hard-working man.
A．can’t; canB．may not; can
C．mustn’t; mustD．may not; must
D

試題分析：句意:一個(gè)工作努力的人可能不會(huì)成為科學(xué)家，但是一個(gè)偉大的科學(xué)家一定是努力工作的人。can’t 不可能，語氣較強(qiáng)；may not 可能不，語氣弱；must 一定。這里考查的是情態(tài)動(dòng)詞表示推測的用法，根據(jù)句意可知選D。
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