用介词或be动词填空,补全句子.by be with about for to 1.Heien has been learning English____3years

题目

用介词或be动词填空,补全句子.by be with about for to 1.Heien has been learning English____3years

答案

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...