問題詳情：
語法專練
In order to make our city more beautiful，more trees and flowers ________ every year.
A．will plant B．should plant
C．should planted D．should be planted
【回答】
D 點撥：本題用語法判定法解題。主句主語為trees and flowers，所以應用被動語態。情態動詞的被動語態構成為：情態動詞＋be ＋ done。故選D。
知識點：動詞語態
題型：選擇題
