These young trees must .A. look after wellB. be look after wellC. be looked wellD. be look

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A. look after well
B. be look after well
C. be looked well
(答案→)D. be looked after well
解析：look after是照顾照看的意思，小树是照看的对象，所以要用被动语态。被动语态结构为be动词加动词的过去分词，所以D为正确答案。