Remembering these new words cost him a lot of time.cost为什么不加

问题描述:

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
1个回答 分类:英语 2014-10-28

问题解答:

我来补答
cost在此做过去式,其过去式与动词原形相同
 
 
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