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.

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

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

3. numbers of wild salmon has been reduced because of uncontrolled deep-sea and coastal netting
4.     wild salmon’s numbers are reduced by deep-sea and coastal netting that is not controlled
5. wild salmon’s numbers have been reduced by uncontrolled deep-sea and coastal netting.

答案选E，但是为什么用完成时呢？好像没有明显的标志啊。用其他时态可不可以呢？

by pollution, and by various other threats to the fish’s habitat.

前面的和后面的不是要平行对等吗？

追问，我选了D。时态我觉得D&E都么啥错，后来觉得E中   by uncontrolled deep-sea and coastal netting 不清楚uncontrolled是修饰DEEP SEA 还是 deep sea and costal netting，所以就。。。请NN看过来

这题通过主谓一致和平行就排除了ＡＢＣ所有选项

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

2. number of wild salmon is reduced because deep-sea and coastal netting is not controlled 缺少by和后面平行

3. numbers of wild salmon has been reduced because of uncontrolled deep-sea and coastal netting 缺少by和后面平行
4.     wild salmon’s numbers are reduced by deep-sea and coastal netting that is not controlled  by后应该跟名词和后面平行
5. wild salmon’s numbers have been reduced by uncontrolled deep-sea and coastal netting.