T-3-Q7. 为什么选E ，迷惑

T-3-Q7.
            

In Scotland, the number of wild salmon have been reduced because of uncontrolled deep-sea and coastal netting, by pollution, and by various other threats to the fish’s habitat.
        

A.      number of wild salmon have been reduced because of uncontrolled deep-sea and coastal netting

B.      number of wild salmon is reduced because deep-sea and coastal netting is not controlled

C.      numbers of wild salmon has been reduced because of uncontrolled deep-sea and coastal netting

D.      wild salmon’s numbers are reduced by deep-sea and coastal netting that is not controlled

E.       wild salmon’s numbers have been reduced by uncontrolled deep-sea and coastal netting

我选的是B 答案是E 不知道B为什么错？不是the number of  .... is  吗？

考点：平行。

E中 by uncontrolled deep-sea and coastal netting，by pollution, and by various other threats to the fish’s habitat三个by平行表原因。

B破坏平行结构。

numbers和number在GMAT中都可以指“数量”，这个用法跟我们中学教材不一样。

 哦，原来考点在这，当时就没看到，谢谢你的回复。