They haven’t finished their work
They haven’t finished their work
finish 为什么没有还原?
finish 为什么没有还原?
英语人气：495 ℃时间：2019-09-17 20:11:03
优质解答
助动词和情态动词后动词才还原,have不是助动词或情态动词,而且,这是现在完成时,固定结构:have ＋动词的过去分词
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