现在完成进行时——过去在做,现在在做,将来也肯能会做
用about
如果是by的话,句子应该是：Heien had learnt English by 3 years.
如果是be 的话,一个句子中不能有两个动词
如果是with的话,句子不通,一般with不跟时间状语
如果是for的话,句子应该是：Heien has learnt English for 3 years.
如果是to的话,句子不通,一般to 后面是动词
用介词或be动词填空,补全句子.by be with about for to 1.Heien has been lea
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