问题
选择题
These young trees must ______.
A．look after well
B．be look after well
C．be looked well
D．be looked after well
答案
答案：D
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。
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