--Tree Planting Day is coming. Do you plant trees in spring?---Yes many trees in our cit

问题补充：

--Tree Planting Day is coming. Do you plant trees in spring?

---Yes, many trees in our city every year.

A. are planting

B. are planted

C. were planted

D. will plant

答案：

A. are planting

(答案→)B. are planted

C. were planted

D. will plant

解析：本题的含义是每年在城市要栽许多树，本题的主语是动作的承受者，故本题用被动结构，结构为be+动词的过去分词，每一年表示一般的情况，故用are planted，故本题选B。