The doctor looked the old man .A. at…careB. over…careful　C. up…carefullyD. over…carefully

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A. at…care
B. over…careful　
C. up…carefully
(答案→)D. over…carefully
解析：医生看病人，当然是检查，故用look over，而不是look at(看)、look up(向上看；拜访（某人）；查找)；后一空应该用副词做状语，修饰谓语动词，故选D。