请教GWD-TN-21中的一道SC

william1119

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 administration improved its management practices.

A.
             be better enforced, and its crime rate reduced

B.       better enforced, and its crime rate reduced

C.      could be better enforced, and it could reduce its crime rate

D.      better enforced, and its crime rate could reduce

E.       could be better enforced, and its crime rate reduce

key: B

想问一下行这样句子的并列可以省could吗？？？这是怎么回事？？？

william1119

大家群策群力帮帮忙！！！谢谢！！！嘿嘿！！！

william1119

这题我觉得挺特别的，想想是这样，但又不知道为什么！！！所以就拿出来和大家讨论下下！！！

william1119

自己在顶上！！！！！

aeoluseros

我认为没有答案...

B里面动词不对称（前一个be是系动词，enforced前面的be是助动词不能省略），C里面it无指代，主被动不平行。