___________you try to do something beyond what you have already mastered, you will never grow.
A．SinceB．WhenC．ThoughD．Unless
D

試題分析：A．Since 自從，因為，B．When 當…時候，C Though雖然，D．Unless除非，如果不，相當于if not…句意：如果你不努力做超出你已經(jīng)掌握的東西，你永遠不會成長。根據(jù)句意選D。
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