Trees must every year．( )A．plantB．plantingC．be plantedD．planted 题目和参考答案——青夏教育精英家教网——

题目内容

8．Trees must ______ every year．（　　）

A．

plant

B．

planting

C．

be planted

D．

planted

分析每年必须种树．

解答答案：C．结合句意trees是动词plant的承受者，构成被动关系，结合情态动词must用情态动词的被动语态---情态动词+be+过去分词，故选C．

点评情态动词的被动语态---情态动词+be+过去分词的呈现，各种类型的被动语态的构成要理解掌握．

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