问题
选择题
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
答案：D
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.