9、Zhong Nanshan,the famous medical scientist,has devoted most of his life ________ useful ways in treating cough diseases.

A.to finding           B.find         C.to find         D.finding

9、A

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Zhong Nanshan,the famous medical scientist,has devoted most of his life ________ useful ways in treating cough diseases.

A.to finding           B.find         C.to find         D.finding

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