--Yes, it’s said that 80 per cent of fish in this river live long.A．doesn’tB．don’tC．isn’tD．aren’t 题目和参考答案——青夏教育精英家教网—

题目内容

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

A．doesn’t

B．don’t

C．isn’t

D．aren’t

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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