There are three _______(knife)in the box.

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There are three _______(knife)in the box.

knives

There are three ___knives____(knife)in the box.
knife是可数名词,复数形式是knives

There are three knives(knife)in the box.
knife变复数是不规则的,复数形式是knives

There are three knives(knife)in the box. 对吗?