Rejecting the urging of his physician father to study medicine, Hawking chose to ______ on math and theoretical physics.

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问题 Rejecting the urging of his physician father to study medicine, Hawking chose to ______ on math and theoretical physics.

选项 A、impose
B、center
C、overwork
D、concentrate

答案D

解析辨义：A．impose征税，强加，可以用做impose sth．on； B．center集中；C．overwork过度工作；D．concentrate“集中注意力于，专心于”，后能直接跟介词on的动词只有center和concentrate，这两个词都有“集中”的意思。故选项A、C可排除。center on指谈话或讨论集中于问题的某一方面；而concentrate则是指集中所有的精力或注意力在一个方面，主语一般是人。

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Rejecting the urging of his physician father to study medicine, Hawking chose to ______ on math and theoretical physics.

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