He needs to care for the sick.A.take care ofB.like or loveC.look afterD.A and C
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D解析care for表示：
①喜欢；爱。如：He cares for her.他爱她。
②照看；爱护 (本文含义) 。如：He has to care for his children.他得照看他的孩子们。
③爱好；感兴趣 (多用于疑问句或否定句) 。如：I don't care for opera.我不喜欢歌剧。
由本题句意“他需要照看病人”，可知D正确。