Jack _________________ (study) in our school for two years.说明为什么

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Jack _________________ (study) in our school for two years.说明为什么

has studied 现在完成时,因为后面的for two years 是现在完成进行时的时间标志.

has studied
一段时间的动作对现在的影响,for 完成时标志之一