题干
A lot of trees _________ around here every year, and we can enjoy fresher air now.
A：were planted
B：are planted
C：will plant
D：are planting
答案(点此获取答案解析）
B
A lot of trees _________ around here every year, and we can enjoy fresher air now.
A：were planted
B：are planted
C：will plant
D：are planting
