◎ 题干
Every year millions of trees _____ to prevent floods, droughts and sandstorms.

[     ]

A. plant
B. are planted
C. are planting
D. were planted
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◎ 解析
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◎ 知识点
    根据n多题专家分析,试题“Every year millions of trees _____to prevent floods, droughts and sandstorms. [ ]A. plant B. are planted C. are planting D. were planted …”主要考查了你对  【被动语态】【一般现在时】  等知识点的理解和应用能力。关于这些知识点的“档案”,你可以点击相应的链接进行查看和学习。