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——Yes, it’s said that 80 per cent of fish in this river ________ live long.

A.doesn’tB.don’tC.isn’tD.aren’t

B

解析试题分析:根据live是原形可知,be动词之后不能跟原形,所以CD应该排除;fish是“鱼”,它的单复数同形,所以百分之八十的鱼应该是复数,故助动词应该用don’t。所以本题选B。
考点:本题考查助动词。
点评:本题的关键有两个:一个是live是原形;另一是fish,当fish作“鱼”讲时,其单复数同形,当作“鱼肉”时,是不可数名词。

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