Lots of trees ________in our city over the years. It is becoming greener and greener!
A．a(chǎn)re plantingB．have planted
C．will be plantedD．have been planted
D
根據(jù)over the years 表示在過的幾年里，一般與現(xiàn)在完成時態(tài)連用，又因為主語為物，是動作的承受者，故要用被動語態(tài)，故選D
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