题目内容

Lots of trees ________in our city over the years. It is becoming greener and greener!
A．are plantingB．have planted
C．will be plantedD．have been planted
D
根据over the years 表示在过的几年里，一般与现在完成时态连用，又因为主语为物，是动作的承受者，故要用被动语态，故选D
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