The old should well.A. be take care ofB. look afterC. be looked afterD. be taking car of

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A. be take care of
B. look after
(答案→)C. be looked after
D. be taking car of
解析：本题考查被动语态。被动语态的构成是be+过去分词。句意:老年人应被好好照顾。