As the saying goes,one is never too old to learn.After he ______ ,he will devote himself to gardening.A.retired B.has retired C.will retire D.had retired 为什么?

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As the saying goes,one is never too old to learn.After he ______ ,he will devote himself to gardening.
A.retired B.has retired C.will retire D.had retired 为什么?

A哦,因为退休是瞬间动词,不可能用完成形态.
有什么不懂的可以追问我~望采纳~

B 只有B has retired是属于现在时态的

根据时态一致的原则,应该选c
这句话的意思是,我们常说活到老学到老。所以他退休后也可以致力于园艺工作。