They often watch fish ___ in the fish tank.(swim)

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They often watch fish ___ in the fish tank.(swim)
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They often watch fish ___ in the fish tank.(swim)
They often watch fish ___ in the fish tank.(swim)

They often watch fish ___ in the fish tank.(swim)
答案是:swim
watch是一个感官动词,后面接宾语补足语的时候可以有两种情况.一是接动词原型,二是接动词ing形式,但意思却强调观察到正在做某事.