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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
根據over the years 表示在過的幾年里，一般與現在完成時態連用，又因為主語為物，是動作的承受者，故要用被動語態，故選D
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