题目内容

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．can’t; mustD．may not; must
D

试题分析：句意：一个勤劳的人不可能成为一个伟大的科学家，但一个伟大的科学家一定是一个勤劳的人。Can能，会；may可以，可能；must必须，一定；can’t不可能，不会；may not不可以，不可能。所以选D。
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