问题
选择题
In order to make our city more beautiful more trees and flowers _________ every year.
A. will plant
B. should plant
C. should be planted
答案
答案：C
题目分析：句意：为了使我们的城市更加美丽，每年应该种更多的树和花。根据句意及题干分析此题应用被动语态，被动语态的基本结构是be+动词的过去分词，所以选C。