Every year millions of trees ▲ to prevent floods, droughts and sandstorms. A. plant B. are pl——青夏教育精英家教网—

摘要： 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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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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