题目内容
These young trees must ______.
A.look after well | B.be look after well | C.be looked well | D.be looked after well |
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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