Remembering these new words cost him a lot of time.cost为什么不加s求具体原因,不要草草了事

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Remembering these new words cost him a lot of time.cost为什么不加s求具体原因,不要草草了事
Remembering these new words cost him a lot of time.cost为什么不加s
求具体原因,不要草草了事

Remembering these new words cost him a lot of time.cost为什么不加s求具体原因,不要草草了事
cost在此做过去式,其过去式与动词原形相同

如果加s就是一般现在时,这里是过去式,说明花过了。
亲:祝你学习进步!望采纳,谢谢!