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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

试题分析:句意:一个工作努力的人可能不会成为科学家,但是一个伟大的科学家一定是努力工作的人。can’t 不可能,语气较强;may not 可能不,语气弱;must 一定。这里考查的是情态动词表示推测的用法,根据句意可知选D。
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