Dr. Zhong Nanshan is a pioneer has made a lot of contributions （贡献） in the field of medical science．（ ）
A．whichB．whoC．whoseD．what
Dr. Zhong Nanshan is a pioneer has made a lot of contributions （贡献） in the field of medical science．（ ）
A．whichB．whoC．whoseD．what
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