That scientist work is successful has been made a model worker.A. whichB. whoC. thatD. w

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A. which
B. who
C. that
(答案→)D. whose
解析：D　考查定语从句。句意：那个工作很成功的科学家已经当选为劳动模范。句中的先行词为That scientist，且空处在定语从句中作定语，修饰名词work，所以用whose引导。