are
这里显然是说河里是很多鱼在游
fish用作可数名词指“鱼的条数”时单数和复数形式相同（two fish两条鱼）,
指“鱼的种类”时复数形式才为fishes（two fishes两种鱼）；
fish用作不可数名词时无复数形式,应作“鱼肉”解（Help yourself to some fish．随便吃些鱼.）；
The fish ____(is /are)swimming in the river.
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