GWD31-Q18

According
to a recent survey of municipal services, the city’s

streets
could be cleaner, its fire code be better
            enforced, and

its
crime rate reduced if the current adrninistration
improved its

management
practices.

1)     
be better enforced, and its
crime rate reduced

2)     
better enforced, and its crime
rate reduced

3)     
could be better enforced, and it
could reduce its crime rate

4)     
better enforced, and its crime
rate could reduce

5)     
could be better en forced, and
its crime rate reduce

我觉得B选项更加对称呀，could be重复应该在平行对称结构里面可以省略的，可是答案是C，C的确语法没错，可是被动和主动混用就不对称了，哪位nn帮忙解释一下吧~~

        

平行结构要注意四方面：时态、结构、词性和功能

有时候功能平行最重要，此题就是