In order to make our city green, ________．

A.it is necessary to have planted more trees

B.many more trees need to plant

C.our city needs more trees

D.we must plant more trees

答案及解析： D

解析：

此题考查动词不定式的逻辑主语。句意：为了绿化我们的城市，我们必须种植更多的树。显然，“绿化城市”的动作是句子的主语发出的，所以只能是D项。本句可改为：We must plant more trees so that we can make our city green.