问题
选择题
Millions of trees _____ around our city every year. Our environment is getting better.[ ]
A. are planting
B. were planted
C. planted
D. are planted
答案
答案：D
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Millions of trees _____ around our city every year. Our environment is getting better.[ ]
A. are planting
B. were planted
C. planted
D. are planted
答案：D