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  • 更新 2022-09-03
  • 科目 英语
  • 题型 单选题
  • 难度 中等
  • 浏览 467

Lots of trees ________in our city over the years. It is becoming greener and greener!

A.are planting B.have planted
C.will be planted D.have been planted
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Lotsoftreesinourcityovertheyea