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he skated for four hours 为什么加for

分类: 作业答案 • 2022-01-09 18:03:03

问题描述：

答

for four hours 是由介词for(达到,累计)构成的介词短语,表明了动作skated共发生了多长时间,是一个时间状语部分,没有for的话,表达不了这个意思.

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he skated for four hours 为什么加for

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