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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 【查看更多】

 

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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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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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