Question

【题目】The environment in our hometown is getting worse and worse. So many trees .
A.are planting
B.should be planted
C.should plant

Answer 1

【答案】B
【解析】句意：我们家乡的环境越来越差了。所以许多树应当被种植。树trees和种植plant的关系是被动，所以应该用被动语态。含情态动词的被动语态的结构式是should+be+动词过去分词。故选B。